This page sells whole-house UV (ultraviolet) water systems for private wells from Mid Atlantic Water, an online-only family company that ships free to the lower 48 states. A UV light kills bacteria, including total coliform and E. coli, as the water flows past the lamp; it adds no chemicals and removes nothing else. Viqua VH410 $995, the UV Aidan recommends for most homes (VIQUA rating: 18 gallons per minute at its standard 30 mJ/cm2 dose, 14 gpm at 40 mJ/cm2; 23.5 by 3.5 inch stainless chamber). Viqua VH200 $895 for a tight space (9 gpm at 30 mJ/cm2, 7 gpm at 40; 17.75 inch chamber). The Water Sanitizer $2,235: a sediment filter, a 1.5 cubic foot carbon tank and a VH200. Replacement lamps: VH410 $170, VH200 $165, changed once a year (rated 9,000 hours); quartz sleeves $145 and $110; controller $345. Water going into a UV should have iron under 0.3 ppm, manganese under 0.05 ppm, hardness under 7 grains per gallon, turbidity under 1 NTU and UV transmittance above 75%, with a 5 micron sediment filter ahead of it. The UV goes on the cold main after the pressure tank, the sediment filter and any iron filter or softener, and the plumbing after it is bleached once at start-up. What ships: the stainless chamber with the quartz sleeve inside, the controller, and the lamp in its own tube. We recommend a licensed plumber; the UV alone usually takes about an hour, and it needs a GFCI outlet. Shocking a well is temporary and bacteria usually comes back; a UV treats every gallon. Test first: the $199 well water test kit checks total coliform and E. coli plus the iron and hardness that decide what goes ahead of the UV. Free sizing with Aidan: call 800-460-5810 or text 443-277-2204.
By Aidan· 32-year water expert, Mid Atlantic Water ·
If your well test found coliform or E. coli, a UV light is the lasting fix. The water flows past a UV lamp that kills the bacteria, with no chemicals. It is the answer when shocking the well did not hold, or a home sale is waiting on a clean retest.
Aidan puts the Viqua VH410 ($995) in almost every home. It needs clean water to work, so a sediment filter goes ahead of it, plus an iron filter or softener if your test shows iron or hard water (over 7 grains).
No chemicals added
About 1 hr for a plumber
Free shipping, lower 48
Free sizing with Aidan
Watch the 3-minute overview
Test before you buy. The lab test that finds bacteria should also show your iron and hardness. Both coat the glass sleeve around the lamp and let bacteria through, so their filter goes ahead of the UV. Send Aidan your results and he will tell you what you need, free. Call 800-460-5810 or text Aidan at 443-277-2204.
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Whole-House UV Systems
The UV goes on the main line, after the sediment filter and any iron filter or softener, and treats every tap. The VH410 is the one Aidan recommends for most homes; it treats up to 18 gallons a minute. The VH200 is shorter, for a tight space, and treats up to 9. Each comes with its controller and the glass (quartz) sleeve already in the chamber; the lamp ships in its own tube.
The Water Sanitizer ($2,235) is three pieces in one package: a sediment filter, a carbon filter tank (1.5 cubic feet) and a VIQUA VH200 UV. The carbon also takes out a chlorine taste and odors. The tank ships empty; the carbon comes in bags and is loaded at install.
Replacement lamps and glass (quartz) sleeves for the VH410 and VH200, the controller that fits both, and Sterilight S8Q-PA parts for older systems. Change the lamp once a year; the controller counts down the days and beeps when it is due. Clean the sleeve periodically (Aidan uses vinegar), and replace it if it will not come clean.
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UV system comparison
Mid Atlantic vs. SpringWell, Aquasana & iSpring
How the VH410 compares with three UV systems shoppers also look at. Each competitor cell comes from that company's own product page, spec sheet or manual, checked September 29, 2026. Prices change, so check before you buy.
MAW Viqua VH410
SpringWell
Aquasana
iSpring
Price
$995 (VH410)
$1,100.50 sale; regular price not confirmed
$1,749 sale ($3,498 list), whole bundle
$338.99
Gallons a minute it treats
18 (14 at the stronger dose)
15 (standard dose, per its manual)
7 for the whole package (its UV part: 5 at the stronger dose)
12 (dose not published)
Replacement lamp
$170 (VIQUA S410RL-HO), once a year
$118.65, every 365 days
$125.99 (AQ-UV-300L), every 12 months
$79.99 (UVB55FS), up to 9,000 hours
What it is
UV alone, 304 stainless chamber
UV alone
Whole-house filter package with a UV light (its UV part is NSF/ANSI 55 Class B listed)
UV alone, 304 stainless
Flow numbers: each gallon needs enough time under the lamp, so a UV treats fewer gallons a minute at a stronger dose. The standard dose is 30 mJ/cm2 and the stronger one 40 mJ/cm2. Text Aidan your well pump's flow and he will size it.
All four makers list the same limits for the water going in: iron under 0.3 ppm and hardness under 7 grains. So whichever you buy, test for them first. Aquasana's price covers a whole filter package, not a UV alone.
Step 1: Find Your Problem
What are the signs of bacteria in well water?
A UV light is the fix when bacteria is the problem: a positive coliform or E. coli test, bacteria that came back after shocking, or a well that surface water can reach. Orange stains, a rotten-egg smell or cloudy water are a different problem: a UV removes none of them, and they have to come out ahead of it.
Coliform or E. coli in your well test
The lab found total coliform or E. coli, often on a test for a home sale. A UV light kills them as the water passes the lamp, every gallon, as long as the water going in is clear.
→YESA UV light fixes this
You shocked the well, and it came back
Shocking kills the bacteria in the well that day. If bacteria keeps getting in, it usually comes back. A UV light treats the water every time you use it.
→YESA UV ends the shock cycle
Shallow, spring-fed or flooded well
Bacteria usually gets into a well from surface water, a septic system or animal waste. A shallow well, a spring, or a well cap that sat in floodwater is more exposed. Test it; if bacteria shows up, a UV is the fix.
→TEST FIRSTTest, then a UV if bacteria shows up
Orange stains, rotten-egg smell or cloudy water
Those come from iron, manganese, sulfur or sediment, not bacteria. A UV removes none of them, and iron, manganese and sediment coat its glass sleeve, so the filter for them goes ahead of the UV.
Hard water too? Above 7 grains per gallon, a water softener goes ahead of the UV, because the lamp's heat bakes the hardness onto its glass sleeve. Iron bacteria or slime? Aidan puts an air-injection iron filter first and the UV after it. Not sure? Test your water, or text Aidan your report.
Aidan puts the VH410 in almost every home, from two people to ten: it has the flow and the capacity, and with bacteria it is never overkill. The VH200 is smaller and fits a tight space. Each gallon needs enough time under the lamp, so a UV treats fewer gallons a minute at a stronger dose; each size shows both numbers.
Bacteria die from the dose of UV light each gallon gets, and the faster the water moves, the less light it gets. The VH410 treats 18 gallons a minute at VIQUA's standard dose and 14 at a stronger one (30 and 40 mJ/cm2); the VH200, 9 and 7. A flow number with no dose next to it tells you little.
What must come out before the UV
Iron, hardness and cloudy water coat the lamp's glass sleeve or block the light, and bacteria get through with no alarm. VIQUA's limits for the water going in: iron under 0.3 ppm, manganese under 0.05 ppm, hardness under 7 grains per gallon, tannins under 0.1 ppm, turbidity under 1 NTU and UV transmittance above 75%, with a 5 micron sediment filter ahead of it. Over any limit, the matching filter or softener goes first. Send Aidan your test and he will check each one for you.
We recommend a licensed plumber. The UV alone usually takes a plumber about an hour. What ships: the stainless chamber with its quartz sleeve inside, the controller, and the lamp in its own tube, which slides in at install. Your plumber supplies the fittings, a short run of copper for the outlet, and a 5 micron sediment filter if you do not have one. Aidan helps your plumber by phone at 800-460-5810.
About 1 hr
Typical time for a licensed plumber to install the UV alone. A full filter system with it takes longer.
3/4 or 1 in
Fits 3/4 inch or 1 inch pipe (3/4 inch female or 1 inch male thread on the chamber). Use metal fittings and at least 10 inches of copper on the outlet.
Phone help
For you and your plumber: Aidan talks through anything unusual about your setup.
What to have ready
A safe (GFCI) outlet that stays onThe lamp runs around the clock. VIQUA requires a ground fault (GFCI) outlet and recommends a surge protector. The controller mounts above the chamber, away from water.
After the sediment filter and softenerAfter the pressure tank, the sediment filter and any iron filter or softener, and before the line branches to any faucet.
Metal fittings, copper on the outletVIQUA recommends metal fittings and at least 10 inches of copper pipe on the outlet, because heat and UV light can wear down plastic pipe.
A 5 micron sediment filter ahead of itRequired by VIQUA, so grit does not coat the quartz sleeve and block the light.
What your plumber will do
Mount the chamber last on the cold main, after the pressure tank, the sediment filter and any softener or iron filter, with room at one end to slide the lamp out, as long as the chamber.
Plumb the inlet and outlet with union and metal fittings and at least 10 inches of copper on the outlet. Do not solder while the pipe is attached to the chamber.
Take the lamp out of its tube, holding it only by the ceramic ends, slide it into the sleeve, and click the connector onto it.
Open the water slowly and check for leaks. Then plug the controller into the GFCI outlet and check that it lights with no alarm.
Run the water for a few minutes, then bleach the plumbing after the UV, water heater included, as VIQUA's manual lays out, so no bacteria is left in the pipes.
Show your plumber exactly what's going in. The system builder generates a plumbing schematic for your specific setup. Send it to your plumber before install day.
Reviews are collected by Stamped.io, a third-party review service that emails customers after their order. Stamped does not let us edit a review’s words or star rating.
★★★★★
Working Well
Had it installed by local plumber. Working awesome and our water is free of coliform and every other bacteria. Saved hundreds over Home Depot, Lowes and the local plumbing houses
SC
Steve C., United States
Verified Buyer
The Water Sanitizer · March 2020
★★★★★
Solution for a well issue
Item arrived in a reasonable time and was easy to install. I appreciate the quick responses Aiden provides to questions or advice needed.
DZ
Daryl Z., United States
Verified Buyer
Viqua VH410 UV System · July 2022
★★★★★
Perfect replacement
Perfect replacement for my UV system. Instructions were clearly written. Be sure to fully tighten the clear tube before turning on the water and check for leaks.
A
Anonymous, United States
Verified Buyer
VH200 UV Replacement Bulb · December 2023
FAQ
Frequently asked questions
Yes, for bacteria. A UV light kills coliform and E. coli as the water flows past the lamp, with no chemicals and no change in taste. It works only on clear water: VIQUA requires a 5 micron sediment filter ahead of it, and iron under 0.3 ppm and hardness under 7 grains. And it treats bacteria only: it removes nothing else and leaves nothing in the pipes after it, which is why the plumbing after a new UV is bleached once.
The Viqua VH410 is $995 and the VH200 is $895; the Water Sanitizer package (sediment filter, carbon tank and a VH200) is $2,235. Shipping is free to the lower 48. A plumber usually installs the UV alone in about an hour. After that, the lamp is $170 a year for the VH410 ($165 for the VH200), plus a new quartz sleeve when the old one will not come clean ($145 or $110).
For most homes, the VH410. Aidan recommends it whether there are two people in the house or ten; with bacteria, he says, it is never overkill. It treats up to 18 gallons a minute. The VH200 is shorter (17.75 inches long vs 23.5) and treats up to 9 gallons a minute, so it suits a tight space in a small home.
A sediment filter, yes: VIQUA requires a 5 micron sediment filter ahead of the chamber. A softener or an iron filter if your test calls for it: VIQUA's limits are under 7 grains of hardness, under 0.3 ppm of iron and under 0.05 ppm of manganese. Above them, minerals bake onto the glass sleeve around the lamp and bacteria can get through, so the softener or iron filter goes ahead of the UV, and the UV after them.
Yes. Shocking kills the bacteria in the well that day; if bacteria keeps getting in, it usually comes back. A UV light treats every gallon as you use it, so you stop re-shocking. One customer chlorinated three times before the UV; after it, the coliform was gone. Once the UV is in, bleach the plumbing after it one time so no bacteria is left in the pipes: the steps are in how to remove coliform bacteria from well water. If the well also has iron bacteria or slime, an iron filter goes ahead of the UV.
Change the lamp once a year, even though it still glows: VIQUA rates it for 9,000 hours (every two years in a seasonal home). The controller counts down 365 days and beeps when it is due. The lamp is $170 for the VH410 and $165 for the VH200. Minerals slowly coat the glass (quartz) sleeve around the lamp: clean it periodically (Aidan uses vinegar), and replace it if it will not come clean ($145 or $110). Hold the lamp only by its ceramic ends.
The lamp is off, so the water is not treated. On most wells the pump is off too, so no water flows. When the power comes back, VIQUA says to wait 5 minutes before running water through the UV, and its manual calls for bleaching the plumbing after the UV again after any time without power. Until then, drink bottled water.
No. A UV kills bacteria and removes nothing else: no iron, manganese, hardness, sulfur smell, chlorine or sediment. Each of those needs its own filter ahead of the UV: an iron filter, a softener, a carbon filter or a sediment filter. Send Aidan your test and he will lay out the order for your home.
Usually no. City water is already disinfected and carries chlorine or chloramine to your tap. The exceptions are a home on frequent boil-water notices, a spring or a cistern. If you are on city water and thinking about a UV, call us first. We would rather talk you out of equipment you do not need than sell it to you.
