Chlorine taste and smell
The Mystic system is chlorinated, as every public supply must be. If you taste it in a glass or in your coffee, carbon filtration is what removes it.
New London County · Connecticut
Water Filtration & Water Treatment in Stonington, CT
Stonington covers the Borough, Pawcatuck, Old Mystic and the eastern half of Mystic village — parts on the Aquarion Mystic system, parts on private wells, and a coastline that shapes both.
- Public water and private wells
- New London County, Connecticut
- ZIP 06378
Water in Stonington
Where Stonington gets its water — and why it matters.
Public water in the Mystic end of Stonington comes from Aquarion’s Mystic system, which serves Groton, Stonington and Ledyard — roughly 11,700 people — drawing about 88% of its supply from the Palmer and Dean’s Mill reservoirs, plus the Lantern Hill Well and water purchased from the Groton treatment plant.
That system’s own reporting describes water that is soft — hardness averaging around 2 grains per gallon — and disinfected with chlorine. Soft water is good news for your fixtures: scale is usually not the problem here. What people notice instead is taste.
Away from the served areas — the rural north end of town toward the North Stonington line, and pockets elsewhere — homes are on private wells, and that is an entirely different conversation.
Sources: Connecticut DPH — Private Well Testing (Publication No. 24) · Aquarion Water Company — Mystic system water quality report. Figures quoted here come from the supplier’s own published water quality reporting and from state health department guidance. For the current year’s numbers, read your supplier’s annual report — they are required to publish one and you are entitled to it.
What homeowners notice
Common water concerns in Stonington.
These are symptoms, not diagnoses. What is actually causing them at your address is a question for a test — but knowing what to look for is where it starts.
Drinking water quality
The most common request on the public side here. An under-sink reverse osmosis system handles what you drink and cook with, and it is a small install.
Iron staining on private wells
Orange rings that return after cleaning. A well problem, not a town-water problem.
Sulfur odor on private wells
Rotten-egg smell, often stronger on the hot side.
Two different starting points
City water and well water are different problems.
Municipal / City Water
If you’re on public water in Stonington
On the Aquarion Mystic system the water arrives soft — around 2 grains per gallon by the utility’s own reporting — which means a water softener is usually the wrong recommendation here. Anyone trying to sell you one in Mystic or the Borough should be asked to show you a hardness number first. What genuinely improves this water for most households is carbon filtration for chlorine taste, and reverse osmosis at the kitchen sink for drinking and cooking.
Private Well
If you’re on a private well in Stonington
On a private well in the north end of Stonington you are on your own for monitoring. Connecticut’s Department of Public Health suggests private well owners test every year for coliform bacteria, nitrate, nitrite, pH, odour, chloride, hardness, colour, sulfate, turbidity, iron and manganese — and test at least once, ideally every five years, for arsenic, uranium and radon, which occur naturally in groundwater in parts of the state.
Every recommendation we make is based on the water conditions in that specific home. We don’t quote equipment before we understand what the water is doing.
Harborline solutions
What we install in Stonington homes.
Four core systems and a set of add-ons. Which one fits depends on your water source and what a test actually finds.
Whole-Home Softener + Filtration
High-capacity softening paired with coconut shell carbon, installed where water enters the house.
Private Well Systems
Dual-tank treatment with air injection for iron, sulfur and manganese, configured to your well.
Iron & Sulfur Removal
Peroxide injection at the point of entry for wells where staining and rotten-egg odour dominate.
Reverse Osmosis Drinking Water
A tankless seven-stage under-sink system on its own faucet, for drinking and cooking.
Carbon & Specialty Filtration
Carbon-only, salt-free conditioning, UV and pre-system sediment filtration where they’re the right call.
Free installation & warranty
Standard installation in the package price, lifetime coverage on qualifying dry parts.
We don’t claim any system removes a specific contaminant from your water. What a given system addresses depends on its actual specifications and on what your water actually contains.
How it works
Five steps, start to finish.
- STEP 01
Tell us what you’re experiencing
Staining, smell, scale, taste — call, text a photo, or send the form.
- STEP 02
We assess the water
Your water source, the conditions in the home, your plumbing and your household’s use.
- STEP 03
We recommend based on results
A clear explanation of the problem, the system that addresses it, and the price — before any work.
- STEP 04
Professional installation
Installed by us, with standard installation labour included in the package price.
- STEP 05
Ongoing support
You know who to call, and your warranty coverage is in writing.
Why Harborline
A straightforward way to buy water treatment in Stonington.
Local Southern New England company
We work in Southern Rhode Island and Eastern Connecticut. You’re not calling a national call centre.
Water first, equipment second
We look at the water before we talk about systems. Not the other way round.
No unnecessary equipment
If your water doesn’t need a softener, we’ll tell you that — and we do tell people that.
Straightforward recommendations
You get the number and the reasoning before the work, not after.
Professional installation
Installed by us, not handed to a subcontractor you’ve never spoken to.
Clear communication and support
Calls and texts get answered, and you know who to reach afterward.
Questions
Stonington water questions, answered.
Does Stonington have hard water?
Not on the Aquarion Mystic system. That utility's own water quality reporting puts hardness at around 2 grains per gallon, which is soft. If someone is trying to sell you a water softener for a home on that system, ask them for a hardness reading first. On a private well, hardness varies and has to be measured.
Where does public water in Stonington come from?
The Aquarion Mystic system, which serves Groton, Stonington and Ledyard. Most of its supply comes from the Palmer and Dean's Mill reservoirs, with additional water from the Lantern Hill Well and purchased from the Groton treatment plant.
Why does my Stonington tap water taste like chlorine?
The Mystic system is disinfected with chlorine, as public water systems are required to be. The taste is aesthetic rather than a safety concern, and carbon filtration is what removes it.
Do homes in Pawcatuck and north Stonington have wells?
Some do, particularly outside the served areas toward the North Stonington line. If you do not receive a water bill, you are on a private well.
Should I test my private well in Stonington?
Connecticut's Department of Public Health recommends an annual test for coliform bacteria, nitrate, nitrite, pH, odour, chloride, hardness, colour, sulfate, turbidity, iron and manganese — and at least one test, ideally repeated every five years, for arsenic, uranium and radon, which occur naturally in groundwater in parts of the state.
Does Harborline serve Stonington Borough and Pawcatuck?
Yes — the Borough, Pawcatuck, Old Mystic, Wequetequock, Lords Point and the east side of Mystic.
Nearby towns we serve
Free water assessment
Better water starts with knowing what’s in it.
Tell us what you’re noticing in your Stonington home. We’ll look at your water, explain what’s going on, and give you a straight recommendation and a real price.
- No pressureNo high-pressure sales pitch — we’ll explain what we recommend, what it costs, and let you make the call.
- Your information is not soldWe use it to contact you about your water. That’s it.
- Clear pricing before any workStandard installation is in the package price, not added at the end.