A laboratory test came back showing coliform
This is the clear case. A certified lab result showing bacteria is the reason UV goes on a system.
Private wells · Add-on, not standard
UV Water Purification for Private Wells in Rhode Island & Eastern Connecticut
We will start with the part most companies leave out: most wells around here do not need a UV light, and we do not include one by default. It belongs on your system when a laboratory test has shown bacteria, or when that is a specific concern of yours.
- Add-on, not standard
- Fitted last in the line
- Annual lamp, spare included
Quoted at the consultation, and only when a lab test calls for it
What this solves
When UV is actually the right answer.
We do not test for bacteria and we do not claim to treat it as a matter of course. Here is the honest version of when this equipment belongs on a house.
A well that floods, or a damaged well cap
Surface water reaching the well is how bacteria get in. Fix the cause first; UV is the backstop.
Someone in the house wants the extra step
A perfectly reasonable thing to want. We will fit it, and we will be clear about what it does.
Not: a general worry with no test behind it
If nothing has shown bacteria, we will tell you to get a lab test before spending money on a lamp.
How it works
How UV works, and what it does not do.
Water passes through a stainless steel chamber around a UV lamp. The light disrupts the DNA of bacteria, viruses and cysts so they cannot reproduce.
It treats living organisms. It does not remove chemicals, metals, iron, hardness or sediment — and cloudy water shields organisms from the light, which is exactly why the UV goes last, after the sediment filter, iron tank and softener have cleared the water.
Nothing is added to your water and nothing is left behind. The lamp either works or it does not, and the ballast has a countdown timer so you know when it is due.
The equipment
What we install.
A whole-home UV sized for a residential well, fitted at the end of the treatment train.
Whole-home UV system
Stainless steel reactor, installed after the rest of the system. A spare lamp comes in the box, so your second year is already covered.
- 12 GPM · 1″ MNPT connections
- Reactor roughly 37″ long — allow clearance to pull the lamp
- 40–55 W · 120 V · under half an amp
- Lamp life about 9,000 hours — roughly 12 months
- Countdown timer on the ballast · spare lamp included
Specifications are the manufacturer’s published figures. We don’t claim a system removes a specific contaminant from your water unless its published specifications support that and a test has shown the contaminant is present.
The install
What the install involves.
Fitted last in the line
After the sediment filter, iron tank and softener. Installed anywhere else, it does not do its job.
An outlet
120 V, under half an amp. It stays powered all the time.
Clearance to service it
About 37 inches of straight clearance, so the lamp can be pulled out once a year.
Added to an existing system
If you already have treatment in place, UV can usually be added without touching the rest.
Worth knowing
What we will and will not tell you about bacteria.
Harborline does not test for bacteria. A certified laboratory does that, and your town or state health department can tell you where to send a sample. Rhode Island’s Department of Health recommends private well owners test for coliform bacteria annually; Connecticut’s Department of Public Health recommends the same.
If a test comes back positive, the first job is finding out how it is getting in — a cracked well cap, a shallow or flooded well, a nearby septic problem. UV treats what reaches the lamp. It does not fix the cause, and nobody should sell it to you as though it does.
We will not tell you your water is unsafe in order to sell you equipment. If you have a test, bring it to the consultation and we will read it with you. If you do not, we will tell you to get one.
Questions
Frequently asked questions.
Do I need a UV light on my well?
Probably not, unless a test has shown bacteria. Most private wells in Southern Rhode Island and Eastern Connecticut do not have a bacteria problem, and we do not fit UV by default. If you have never tested, test first — both state health departments recommend testing for coliform annually regardless.
How often does the lamp need replacing, and what does it cost?
Annually — the lamp runs about 9,000 hours, which works out to roughly twelve months. A spare lamp comes with the unit, so your second year is already covered. It is about a ten-minute swap you can do yourself, or we will do it.
Does UV remove iron, hardness or chemicals?
No. UV only deals with living organisms — bacteria, viruses and cysts. Iron, manganese, hardness, sediment, chlorine and chemical contaminants all need different equipment. Anyone describing UV as general-purpose purification is misleading you.
Why does the UV go last in the system?
Because the light has to actually reach the organisms. Iron, sediment and cloudiness shield them, so a UV lamp installed ahead of the filtration is far less effective. Sediment filter, then iron tank, then softener, then UV, then the house.
Does it change the taste of the water, or add anything?
Neither. Nothing is added and nothing is left behind. It is light, not a chemical treatment, which is the main reason people prefer it to chlorination on a private well.
Will it reduce my water pressure?
No. The unit is rated at 12 GPM, which is above what a house draws with everything running — typically six to eight. Flow ratings are maximums, not settings.
Can I add UV later, after the rest of the system is in?
Yes. It fits at the end of the line and can usually be added without disturbing the existing equipment. Plenty of people do it that way, especially if they test after install and find something.
What happens if the lamp burns out and I do not notice?
The ballast has a countdown timer showing lamp hours, which is your warning. Water keeps flowing when a lamp fails — it simply stops being treated — so the timer is worth looking at. If an alarm or a flow shutoff matters to you, say so at the consultation and we will price a unit that has one.
Free water consultation
Better water starts with knowing what’s in it.
Tell us what you’re noticing. We’ll look at your water, explain what’s going on, and give you a straight recommendation and a real price — installation included.
- No pressureNo high-pressure sales pitch — we’ll explain what we recommend, what it costs, and let you make the call.
- If you don’t need it, we’ll say soWe’d rather tell you that than sell you equipment your water doesn’t call for.
- Clear pricing before any workStandard installation is in the package price, not added at the end.