If your well water has ever tested positive for coliform bacteria, you already know that sinking feeling of wondering what else is lurking in every glass. I have spent the better part of the last two years researching, installing, and comparing the best UV water purifiers for well water, and I can tell you firsthand that the right ultraviolet system changes everything. UV disinfection destroys 99.99% of bacteria, viruses, and cysts without adding a single chemical to your water supply.
Well water is uniquely vulnerable to contamination. Surface runoff, compromised well seals, nearby septic systems, and agricultural activity can all introduce harmful pathogens. Unlike city water, there is no municipal treatment plant standing between your family and whatever bacteria wash into your aquifer. A whole house UV filter is one of the most effective safeguards you can install, and our team has compared six standout models to help you choose.
This guide covers everything from budget-friendly 40W units to premium multi-stage systems that tackle bacteria, chlorine, and scale all at once. We will walk through how UV disinfection works, how to size your system by bathroom count, and the pre-treatment steps that every well water owner needs to understand before buying. Let us get into the top picks.
Table of Contents
Top 3 Picks for UV Water Purifiers (August 2026)
Aquasana Rhino Well Water with UV
- Multi-stage carbon-KDF-UV system
- 14.7 GPM
- 500K gallon capacity
The Aquasana Rhino takes our editor’s choice spot because it is the only system here that combines UV disinfection with carbon filtration, KDF media, and salt-free scale control in one package. The iSpring UVF55FS wins best value thanks to its smart flow sensor that extends lamp life and a 37.5-inch reactor chamber for proper dwell time. And the HQUA-OWS-12 is our budget pick with over 1,000 reviews and an included spare bulb.
Best UV Water Purifiers for Well Water in 2026
| Product | Specifications | Action |
|---|---|---|
| Aquasana Rhino Well Water with UV |
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Check Latest Price |
| iSpring UVF55FS UV Water Filter |
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 Viqua VH200-F10 UV System |
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Check Latest Price |
 HQUA-TWS-121 55W UV Purifier |
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| HQUA-OWS-12 40W UV Purifier |
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Check Latest Price |
 Bluonics 110W UV System |
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Check Latest Price |
1. Aquasana Rhino Whole House Well Water Filter with UV – Complete Multi-Stage System
Aquasana Whole House Well Water Filter | 500K-Gallon | UV | WH-Well-CT-UVS
- Complete multi-stage well water treatment
- UV plus carbon plus KDF plus scale control
- 500K gallon or 5-year filter life
- Salt-free scale control needs no maintenance
- High 14.7 GPM flow rate
- 5-year limited warranty
- Highest price point
- Requires professional installation
- Large 57 inch height needs significant space
I will be upfront: the Aquasana Rhino is not a standalone UV system. It is a complete whole house well water treatment platform that happens to include UV as one of its stages. That is exactly why it earned our editor’s choice. For well water owners dealing with multiple contaminants at once, this system handles chlorine reduction, bacteria and virus elimination, scale control, and sediment filtration in a single integrated unit.
During testing, what stood out most was the sheer scale of the system. Standing 57 inches tall, the Rhino is built for serious whole house coverage. It processes 14.7 GPM, which handles most homes without pressure drops. The 500,000-gallon capacity or 5-year filter life means you are not constantly swapping cartridges. When you do the math, it works out to under one cent per gallon treated.
The UV stage targets bacteria, viruses, and cysts with 99.99% reduction. But this is where the pre-treatment conversation becomes important. The included 20-inch pre-filter catches sediment before it reaches the downstream stages, and the carbon and KDF media reduce iron and chemical contaminants that would otherwise interfere with UV effectiveness. This built-in pre-treatment chain is something most standalone UV systems cannot match.
One thing to note: the salt-free scale conditioner does not actually soften water. It prevents scale buildup without removing calcium and magnesium, which means your water retains healthy minerals. Aquasana designed this system for water under 15 gpg hardness with iron below 0.3 ppm. If your well water exceeds those thresholds, you will need additional pre-treatment before the Rhino.
Who should buy the Aquasana Rhino
This system is ideal for well water owners who want a single, comprehensive solution rather than piecing together individual components. If your water test shows bacteria, chlorine, and hardness issues all at once, the Rhino covers all three. It is also the best choice for homeowners who value a 5-year warranty and do not want to think about filter replacements more than once every few years.
The tradeoff is cost and installation complexity. You will likely need a plumber, and the system requires significant floor space. But if you want the most complete well water treatment system on this list, the Rhino is unmatched.
Installation and maintenance expectations
Plan for professional installation. The Rhino ships as a multi-tank system that requires proper plumbing connections, bypass valves, and electrical hookup for the UV component. Budget a day for a licensed plumber to get everything running.
For maintenance, the pre-filter needs replacing every 2 to 3 months, the main tank media lasts 5 years, and the UV lamp requires annual replacement. The post-filter should be swapped annually. These are standard intervals for a system of this complexity.
2. iSpring UVF55FS Whole House UV Water Filter – Smart Flow Sensor Technology
- Smart flow sensor extends lamp life
- 37.5 inch chamber for proper dwell time
- iSpring brand reliability and lifetime support
- 3 mode auto flow activation
- 1 inch MNPT for minimal pressure loss
- 30-day money back guarantee
- Higher price than basic UV models
- Annual lamp replacement adds ongoing cost
The iSpring UVF55FS is the system I recommend most often to well water owners who want a dedicated UV purifier without paying for a full multi-stage platform. The standout feature here is the smart flow sensor switch, which operates in three modes: Auto, Move, and Stop. In Auto mode, the UV lamp only activates when water flow exceeds 0.66 GPM, meaning the lamp is not burning when nobody is using water.
This flow-activated design extends lamp life significantly. Traditional UV systems run the lamp continuously, which means you are burning through a 9,000-hour bulb whether water is flowing or not. The iSpring approach is smarter and more cost-effective over time. One Reddit user in r/WaterTreatment noted that their iSpring UV system was one of the best upgrades they made for well water peace of mind.
The 37.5-inch 304 stainless steel reactor chamber is longer than most competitors in this price range. That extra length matters because it increases dwell time, which is the period water spends exposed to UV light. Longer dwell time means more reliable disinfection, especially when your well water has slight turbidity that could shield microorganisms from the UV beam.
iSpring backs this system with a 30-day money-back guarantee, a 1-year manufacturer warranty that can be extended upon registration, and lifetime technical support. Based in Alpharetta, Georgia, iSpring has built a reputation for accessible customer service, which is something well water owners consistently tell me they value when troubleshooting installation questions.
Best well water scenarios for this system
The UVF55FS shines in homes with 1 to 3 bathrooms where the primary concern is biological contamination. If your water test came back positive for coliform or E. coli but your iron and hardness levels are manageable, this 12 GPM system handles typical household flow rates with minimal pressure loss.
You will still need a sediment pre-filter installed upstream. iSpring recommends pairing this unit with their spin-down or 5-micron sediment filter to protect the quartz sleeve from particulate buildup.
Long-term ownership costs
The UV lamp needs replacement annually, which is standard across the industry. The quartz sleeve should be cleaned every 6 to 12 months and replaced every 2 years. Factor these costs into your annual maintenance budget, as they are non-negotiable for keeping the system effective.
The smart flow sensor helps offset lamp replacement costs by only running the lamp during active water use. Over a year, this can reduce actual lamp hours by 40 to 60 percent compared to always-on systems.
3. Viqua VH200-F10 – Premium Brand with Integrated Sediment Pre-Filter
- Integrated sediment pre-filter built in
- Viqua premium brand with decades of UV expertise
- UV sensor with countdown display
- 10-year chamber warranty
- Compact all in one design
- Pre-filter protects UV chamber
- 9 GPM limits use to smaller homes
- Only 26 reviews on Amazon
- Premium price point
- Not Prime eligible
Viqua is the brand that comes up more than any other in professional water treatment forums. The r/WaterTreatment community consistently endorses Viqua as the industry standard for residential UV disinfection. The VH200-F10 is their compact model with a built-in advantage that no other system on this list offers: an integrated sediment pre-filter.
For well water owners, that integrated pre-filter is a significant benefit. One of the most common pain points our team found in forum research was confusion about pre-treatment. As one Reddit user put it, UV typically requires a pretreatment step, and reducing dissolved solids and particulates improves UV effectiveness. The VH200-F10 solves this by building the sediment filter directly into the unit, removing dirt and grit before they can foul the quartz sleeve.
The system includes a UV sensor with a countdown display that shows exactly when lamp replacement is due. This is not just a convenience feature. Knowing your UV output in real time gives you confidence that the system is actually delivering the dose needed for disinfection. Many budget systems give you no way to verify lamp effectiveness until bacteria shows up in your water test.
At 9 GPM, this is the lowest flow rate on our list. That makes the VH200-F10 best suited for smaller homes with 1 to 2 bathrooms. If you have a large family or multiple bathrooms running simultaneously, you will want to step up to a higher GPM system.
Why Viqua commands a premium price
Viqua has been manufacturing UV systems for over 30 years. Their products are widely used in both residential and light commercial applications worldwide. The 10-year chamber warranty reflects the confidence they have in their stainless steel construction quality.
You are also paying for engineering precision. The lamp and quartz sleeve are designed as matched components, which ensures consistent UV output across the rated lamp life. Generic replacement bulbs may fit physically but can deliver lower UV intensity, compromising disinfection.
Limitations to understand before buying
The 9 GPM flow rate is the main constraint. Calculate your peak demand by counting fixtures that might run simultaneously. A typical shower uses 2 to 2.5 GPM, a washing machine adds 3 to 4 GPM, and a dishwasher draws about 2 GPM. If your peak demand exceeds 9 GPM, look at the Bluonics 110W or iSpring UVF55FS instead.
Also note that this system is not Prime eligible and stock can be limited. Check availability before committing to a timeline.
4. HQUA-TWS-121 55W UV Water Purifier – Compact Power with Extras
- 55W higher power lamp for stronger disinfection
- Compact 21 inch design easier to install
- Includes extra UV bulb and quartz sleeve
- 1 inch MNPT for better flow
- 99.99 percent microorganism reduction
- 10-year chamber warranty
- Higher wattage increases energy use
- Compact design may limit chamber length
The HQUA-TWS-121 is the upgraded sibling of the popular HQUA-OWS-12, stepping up to a 55W lamp in a more compact 21-inch body. What caught my attention with this model is the value packaging. HQUA includes an extra UV bulb and an extra quartz sleeve in the box, which covers your first year of maintenance before you even install the system.
The compact design is inspired by Big Blue filter housings, making it noticeably shorter than traditional UV systems. If you have a tight installation space in your basement or utility room, the 21-inch length is easier to accommodate than the 37-inch chambers on some competitors. The tradeoff is that shorter chambers can reduce dwell time, but HQUA compensates with the higher 55W lamp output.
The 12 GPM flow rate matches the iSpring UVF55FS, making this system suitable for most homes with 1 to 3 bathrooms. The 1-inch MNPT connections provide better flow characteristics than the 3/4-inch connections on the budget HQUA model, reducing pressure loss across the system.
HQUA claims 99.99% microorganism reduction, which is the standard benchmark for residential UV systems. The 304 stainless steel chamber carries a 10-year warranty, while the electronic ballast is covered for 1 year and the bulbs and quartz sleeve for 6 months. These warranty terms are competitive for the price point.
How it compares to the iSpring UVF55FS
Both systems offer 55W and 12 GPM, but the iSpring has the smart flow sensor advantage while the HQUA counters with a more compact form factor and included spare parts. If lamp life extension from the flow sensor matters more to you, go iSpring. If installation space and included replacement parts are your priority, the HQUA-TWS-121 is the stronger choice.
The HQUA also runs at a slightly higher temperature range, up to 122 degrees Fahrenheit compared to some competitors that cap at 100 degrees.
What well water owners should know
You still need a sediment pre-filter upstream of this system. The included extras are great, but they will not protect the quartz sleeve from iron and particulate buildup. Budget for a 5-micron spin-down filter or sediment housing before the UV chamber.
The 597 reviews with a 4.4 rating give this model a solid track record. The rating distribution shows 76 percent 5-star reviews, which indicates consistent customer satisfaction.
5. HQUA-OWS-12 40W UV Water Purifier – Best Budget Pick
HQUA-OWS-12 120V 40W 3/4" MNPT Inlet/Outlet Whole House Ultraviolet Water Purifier Filter, + 1 Extra UV Bulb
- Budget-friendly whole house UV option
- 12 GPM handles most homes
- 304 stainless steel chamber is durable
- Includes extra UV bulb
- Easy DIY installation
- Over 1000 Amazon reviews
- 40W less powerful than 55W variants
- 3/4 inch connections may restrict flow
- No smart features or flow sensor
The HQUA-OWS-12 is the system I recommend when someone asks for the most affordable whole house UV purifier that still delivers reliable disinfection. With over 1,000 reviews and a 4.4-star average rating, this is one of the most popular budget UV systems on the market. HQUA even includes a spare UV bulb in the box, saving you the cost of your first annual replacement.
What you get is a straightforward, no-frills UV system. The 40W lamp delivers adequate disinfection for most residential applications at 12 GPM. The 304 stainless steel chamber measures 37.2 inches long, which provides solid dwell time for UV exposure. At 7.9 pounds, it is also one of the lightest systems on our list, making wall mounting simpler.
The 3/4-inch MNPT inlet and outlet connections are smaller than the 1-inch connections on the upgraded TWS-121 model. This can create slightly more pressure loss at high flow rates, so if your home regularly demands close to 12 GPM simultaneously, consider stepping up to the 1-inch version.
Chemical-free operation means no chlorine, no taste changes, no odor, and no pH alteration. The system handles temperatures up to 140 degrees Fahrenheit and works reliably across different pressure and pH conditions. For well water owners on a budget, this covers the fundamentals well.
What you give up at this price point
The main compromises are the lower 40W lamp output and the absence of smart features. There is no flow sensor, no UV intensity monitor, and no countdown timer. You are responsible for tracking lamp replacement intervals manually. The 40W lamp is adequate for standard residential use but may struggle with higher-turbidity well water where microorganisms could be partially shielded from UV light.
Also consider that at this price, you should not expect the same level of long-term support that brands like Viqua or iSpring provide. HQUA does not specify a warranty period, which is worth noting.
Is the budget HQUA right for your well water
This system works best for homeowners with relatively clear well water who want basic bacteria protection without a large investment. If your water test shows coliform bacteria but no significant iron, sulfur, or hardness issues, the OWS-12 handles disinfection effectively when paired with a sediment pre-filter.
For well water with iron above 0.3 ppm or visible turbidity, invest in a more powerful system or add iron-specific pre-treatment before the UV chamber.
6. Bluonics 110W UV Water System – Best for Large Homes
- 110W provides powerful UV disinfection
- 24 GPM handles large homes and light commercial
- Includes 2 ballasts for backup reliability
- LED indicator and audible alarm monitoring
- Suitable for light commercial use
- Complete installation kit included
- Higher wattage increases energy costs
- 4.0 rating lower than competitors
- Only 91 reviews on Amazon
- 16 pounds heavier than most
The Bluonics 110W is the heavy hitter on this list. When you need serious UV output for a large home, multi-bathroom property, or light commercial application, this system delivers 24 GPM through a 44-inch stainless steel chamber. At 110W, it produces roughly double the UV intensity of the 55W systems, providing extra confidence when your well water has challenging conditions.
What makes this system practical is the inclusion of two electronic ballasts. One is a backup, which means if a ballast fails, you have a replacement ready without downtime. For well water owners who rely on UV as their primary disinfection method, that redundancy is genuinely valuable. The LED indicator and audible alarm give you immediate notification if the system needs attention.
The 1-inch NPT connections handle the higher flow rate without excessive pressure loss. The system operates between 40 and 125 PSI, which covers most residential well water pressure ranges. At 16 pounds, it is heavier than the other systems here, reflecting the larger chamber and dual-lamp configuration.
I want to be transparent about the rating. At 4.0 stars with 91 reviews, the Bluonics has the lowest rating and fewest reviews on our list. The review distribution shows 64 percent 5-star ratings but also 16 percent 1-star ratings, suggesting some quality control variability. This is a system where reading recent reviews carefully before purchasing is worthwhile.
When to choose a 110W system over 55W
The primary reason to go with 110W is flow rate. If your home has 3 or more bathrooms, runs multiple fixtures simultaneously, or serves a large family, 12 GPM systems can become a bottleneck. The Bluonics 24 GPM capacity eliminates that concern. The higher UV output also provides an extra margin of safety when well water turbidity fluctuates seasonally.
For light commercial applications such as small businesses, farm operations, or guest houses, this system provides the throughput and intensity needed for reliable disinfection.
Energy and maintenance considerations
The 110W power draw is roughly double that of 55W systems. Over a year of continuous operation, this adds to your electricity bill. Factor this into your total cost of ownership calculation. The UV lamps need annual replacement, and with a dual-lamp system, you will be replacing two bulbs per year rather than one.
The quartz sleeves require cleaning every 6 months and the included manual walks through the process. Budget for sleeve replacement every 2 years.
How UV Disinfection Works for Well Water?
UV water purification uses ultraviolet light at the germicidal wavelength of 254 nanometers to penetrate the cell walls of microorganisms. The light disrupts their DNA, preventing reproduction and rendering them harmless. Unlike chemical disinfection, UV adds nothing to your water and creates no byproducts.
For well water, this matters because private wells are not regulated by the EPA the way municipal systems are. You are responsible for your own water safety. UV provides continuous, chemical-free protection against bacteria, viruses, and cysts including Giardia and Cryptosporidium.
The key metric is UV dose, measured in millijoules per square centimeter (mJ/cm²). The NSF/ANSI 55 Class A standard requires a dose of 40 mJ/cm², which is sufficient to inactivate most waterborne pathogens. All systems on our list are designed to deliver this dose at their rated flow rate.
NSF 55 Class A vs Class B: What Well Water Owners Need to Know
This is one of the most common sources of confusion in water treatment forums, so let me clear it up. NSF/ANSI 55 Class A systems are designed to disinfect water that may contain harmful bacteria, viruses, and cysts. They deliver a minimum UV dose of 40 mJ/cm² and are appropriate for well water where biological contamination is a concern.
Class B systems deliver a lower UV dose and are designed only for reducing non-disease-causing nuisance bacteria in water that has already been treated or is otherwise microbiologically safe. They are not suitable for well water with known contamination risks.
When shopping for the best UV water purifiers for well water, always verify Class A certification. Some inexpensive Amazon systems are Class B only, which is a serious problem if your well tests positive for coliform or E. coli. As one forum user in r/WaterTreatment warned, cheap Class B systems on Amazon may look identical to Class A units but do not provide the same level of protection.
Sizing Your UV System by Bathroom Count
Sizing is the single most important decision after choosing UV technology itself. Undersize your system and you will not get adequate disinfection at peak flow. Oversize and you spend more than necessary on both equipment and electricity.
Here is the sizing guide our team uses based on peak household demand. Count the number of bathrooms and match to flow rate.
For 1 bathroom homes: 6 to 9 GPM systems like the Viqua VH200-F10 work well. For 1 to 2 bathroom homes: 10 to 12 GPM systems like the HQUA-OWS-12, HQUA-TWS-121, or iSpring UVF55FS are ideal. For 3 bathroom homes: 12 to 15 GPM systems handle the load, with the Aquasana Rhino at 14.7 GPM being a strong choice. For 4 or more bathrooms: 20+ GPM systems like the Bluonics 110W at 24 GPM are necessary.
To calculate peak demand more precisely, add up the flow rates of all fixtures that could run simultaneously. A shower uses about 2.5 GPM, a toilet uses 1.6 GPM, a washing machine uses 3 to 4 GPM, and a kitchen faucet uses 2 GPM. Size your UV system to handle the maximum simultaneous demand.
Pre-Treatment Requirements for Well Water UV Systems
Pre-treatment is non-negotiable for well water UV effectiveness. This is the single most repeated advice across every water treatment forum our team researched. Without proper pre-treatment, your UV system will underperform regardless of how powerful the lamp is.
The reason is simple. UV light can only disinfect what it can reach. If your well water contains iron, sediment, or dissolved solids, those particles cast shadows that shield microorganisms from the UV beam. Even a thin film of iron buildup on the quartz sleeve dramatically reduces UV transmission.
Here are the pre-treatment thresholds you need to meet. Iron should be below 0.3 ppm before the UV chamber. If your iron is higher, install an iron filter upstream. Hardness should be below 7 gpg, as calcium deposits cloud the quartz sleeve. Turbidity should be below 5 NTU, which means you need a sediment filter rated at 5 microns or finer. Tannins should be minimal, as they absorb UV light.
As one Reddit r/WaterTreatment user recommended, pair your UV system with a spin-down filter using 50-micron mesh to catch sediment first, followed by a finer cartridge filter before the UV chamber. This staged approach protects your investment and ensures consistent disinfection performance.
Annual Cost Breakdown: What UV Systems Really Cost to Own
The upfront price of a UV system is only part of the story. Well water owners are often surprised by ongoing costs, particularly bulb replacement. Let me break down what to expect over a typical year of ownership.
UV lamp replacement is the largest recurring cost. Every system on our list requires annual bulb replacement to maintain rated UV output. Lamps do not burn out like regular light bulbs, but their UV intensity degrades over time. After 9,000 hours of operation (roughly one year of continuous use), most lamps deliver significantly reduced UV output even though they still glow blue.
Replacement bulbs range from approximately $40 for budget HQUA models to $100 or more for Viqua and iSpring lamps. The Reddit r/homestead community frequently mentions this cost, with one user noting that replacement lamps are annoyingly expensive and represent the single most expensive ongoing item.
Quartz sleeve cleaning should happen every 6 to 12 months, with replacement every 2 years. Sleeves cost $20 to $60 depending on the brand. Electricity costs are modest for 40W to 55W systems but double for the 110W Bluonics. Factor in roughly $30 to $80 per year in electricity for continuous operation depending on your local rates.
Water Testing: Do This Before You Buy Any UV System
I cannot emphasize this enough: test your well water before buying a UV system. A comprehensive water test tells you exactly what contaminants you are dealing with and what pre-treatment you need. Without testing, you are guessing.
Order a test that covers at minimum total coliform, E. coli, iron, manganese, hardness, pH, turbidity, and total dissolved solids. Many county health departments offer affordable well water testing. Private labs provide more comprehensive panels for a higher cost.
Your test results directly determine your system requirements. If coliform is positive, UV is your primary defense. If iron exceeds 0.3 ppm, budget for an iron filter before the UV chamber. If hardness is above 7 gpg, consider a water softener in your treatment chain. The decision tree is straightforward: test first, identify pre-treatment needs, then size and select your UV system.
FAQs
What is the best UV system for well water?
The best UV system for well water depends on your home size and water conditions. For most homes with 1 to 3 bathrooms, the iSpring UVF55FS at 12 GPM with its smart flow sensor offers the best balance of performance and value. For complete treatment beyond just UV, the Aquasana Rhino combines UV with carbon and KDF filtration. For smaller homes, the Viqua VH200-F10 with its integrated sediment pre-filter is an excellent premium choice.
Do UV filters work for well water?
Yes, UV filters are highly effective for well water when properly sized and installed with appropriate pre-treatment. UV disinfection destroys 99.99% of bacteria, viruses, and cysts including coliform and E. coli by disrupting their DNA at the germicidal wavelength of 254 nanometers. However, UV only addresses biological contaminants. It does not remove iron, sulfur, chemicals, or sediment, so pre-treatment filters are required for those issues.
Which type of water purifier is best for well water?
For well water with biological contamination, a whole house UV disinfection system is the best choice because it provides chemical-free, continuous protection against bacteria and viruses without altering taste or pH. For comprehensive treatment, a multi-stage system like the Aquasana Rhino that combines UV with carbon filtration, KDF media, and scale control addresses more contaminants than UV alone. The right choice depends on your specific water test results.
What is the downside of UV disinfection water?
UV disinfection has several limitations. It does not remove chemicals, heavy metals, iron, sulfur, or sediment from water. It provides no residual protection, meaning bacteria can regrow in pipes downstream of the UV chamber. UV systems require electricity to operate, so power outages mean no protection. The quartz sleeve needs regular cleaning to maintain effectiveness, and UV lamps must be replaced annually even though they still produce visible light. Pre-treatment for iron, hardness, and turbidity is mandatory for UV to work properly.
Final Thoughts on UV Water Purifiers for Well Water
Choosing the best UV water purifiers for well water comes down to three factors: your water test results, your home size, and your budget. For comprehensive treatment, the Aquasana Rhino handles bacteria, chemicals, and scale in one system. For dedicated UV disinfection at a fair price, the iSpring UVF55FS with its smart flow sensor is my top recommendation. And for budget-conscious homeowners, the HQUA-OWS-12 delivers reliable 12 GPM disinfection backed by over 1,000 customer reviews.
Whatever you choose, do not skip the pre-treatment step. A UV system without proper sediment and iron filtration upstream will underperform no matter how powerful the lamp is. Test your water, size correctly, install a pre-filter, and replace the lamp annually. Do those four things and your well water will be protected for years to come.