Watertown Tap Water Quality Report
Watertown's water has 3 contaminants above EPA MCLGs. Consider using a certified water filter for additional protection.
No single water system serves most of Watertown (22,497 residents, Census 2024 estimate). Its large systems are WATERTOWN WATER & SEWER AUTHORITY (EPA counts 9,972 people served, about 44% of Watertown's population); WATERTOWN FIRE DISTRICT (EPA counts 6,718 people served, about 30% of Watertown's population). EPA's counts may include people served outside Watertown, so each share is at most that. Check which one bills you: each system's figures are shown separately below.
- WATERTOWN WATER & SEWER AUTHORITY: 43 contaminants tested, 3 above EPA MCLGs; health-based violations since 2020: 0
- WATERTOWN FIRE DISTRICT: 164 contaminants tested, 2 above EPA MCLGs; health-based violations since 2020: 0
1 other system serving parts of Watertown reports results above guidelines — check which system bills you. WATERTOWN FIRE DISTRICT (2 above guidelines)
Water systems
2 large systems
Residents (Census 2024)
22,497
Health-based violations since 2020
0
WATERTOWN WATER & SEWER AUTHORITY. EPA SDWA violation data as of Q2 2026 (downloaded 2026-07-09).
Latest sample on file
Nov 2024 · WATERTOWN WATER & SEWER AUTHORITY
Utilities publish newer results in their annual water quality report (Consumer Confidence Report).
Is Watertown Tap Water Safe to Drink?
We recommend using a certified water filter for additional protection, especially for vulnerable populations like children, pregnant women, and those with compromised immune systems. Watertown's water has 3 contaminants above EPA health-based guidelines (MCLGs), while it meets federal legal limits.
WATERTOWN WATER & SEWER AUTHORITY, Watertown's water system, serves 9,972 people. 1 other system also serves parts of Watertown. Each system's results are listed under its own name, never added to WATERTOWN WATER & SEWER AUTHORITY's. Water quality testing is conducted regularly and reported to the EPA. The latest sample on file for WATERTOWN WATER & SEWER AUTHORITY is from Nov 2024.
Boil water advisories are issued by water systems and state agencies, and they change from day to day. Boil water advisories in Connecticut
Watertown Water Service Areas
What these numbers actually mean for Watertown, CT
We read Watertown, CT’s published record and send you a short report — which findings warrant a decision, which to ignore, and what to do about it. Including when the answer is nothing.
- 3 contaminants above EPA MCLGs and 1 contaminant with an EPA health goal detected in some samples (no level on file)
- 38 results on file
- 23 PFAS compounds on record
Buying a home here? Property Water Report — $49 Emailed within one business day.
Fluoride in Watertown's water
WATERTOWN WATER & SEWER AUTHORITY
PWSID CT1530021
No fluoride level in our data for WATERTOWN WATER & SEWER AUTHORITY. Your utility's annual water quality report (CCR) lists it.
WATERTOWN FIRE DISTRICT
PWSID CT1530011
WATERTOWN FIRE DISTRICT reported no detectable fluoride.
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Recommended Water Filters for Watertown
Based on Watertown's water quality data, these NSF-certified filters are recommended to remove contaminants above EPA MCLGs.
Culligan
ZeroWater
NSF Certified:
Flow Rate
1.9 gpm
Daily Production
1 gpd
Highlights:
- Compact design
- Easy to set up
- Affordable
- NSF-42, NSF-53, NSF-401 certified
Removes 19 contaminants:
+14 more
Strontium, Molybdenum, Fluoride, Uranium, Lead, Total PFAS, Chlorine, 25, Phosphorus, Bicarbonate, Calcium, Carbonate, Magnesium, Sodium
Santevia
Bath Filter
NSF Certified:
Flow Rate
0.36 gpm
Highlights:
- Organic cotton design reduces plastic used in construction
- Affordable upfront & ongoing cost
- The only bath filter that removed 100% chlorine with “normal” faster faucet flow
Removes 1 contaminants:
Waterdrop
A1
NSF Certified:
Flow Rate
1 gpm
Highlights:
- Performance certified
- Lower price than Philips
- Hot water dispensing
- Compact design
Removes 5 contaminants:
Whirlpool Corporation
W11256135
NSF Certified:
Capacity
1001 gal
Filter Life
3 mo
Flow Rate
0.7 gpm
Removes 19 contaminants:
+14 more
Benzene, Carbofuran, Chlorine (Free), Chlorine (Total), Chlorine Dioxide, Chlorobenzene, Cryptosporidium, Ethylbenzene, Lead, Mercury, Metolachlor, Tetrachloroethylene, Toxaphene, Turbidity
Verify Your Water Quality with Independent Testing
With 3 contaminants above EPA MCLGs and 1 contaminant with an EPA health goal detected in some samples (no level on file), independent laboratory testing provides a second opinion and can track changes over time.
SimpleLab
Advanced Home Water Test
$269
Comprehensive water analysis testing over 200 contaminants including bacteria, heavy metals, and chemical compounds.
Tap Score
Haloacetic Acids (HAA9) Test
$275
Tests for disinfection byproducts formed when chlorine reacts with organic matter in water treatment.
Tap Score
Advanced Microplastics Test
$829
Cutting-edge testing for microplastics particles in drinking water using advanced laboratory techniques.
With 3 contaminants above health guidelines, you may want to explore water purification options. Learn how to make distilled water at home for applications like humidifiers, CPAP machines, and baby formula.
What Watertown's water readings can explain
Utility-reported data for Watertown includes turbidity — the readings behind these common tap water questions. Each page starts with the hot-tap and cold-tap check, then shows what your own water system reported.
On a private well near Watertown? Public-water results do not apply to private wells. See Naugatuck Valley Planning Region well water testing and USGS risk data — modeled arsenic, nitrate, and the tests to run.
Frequently Asked Questions About Watertown Tap Water
Watertown's water has 3 contaminants above EPA MCLGs. While the water meets federal legal limits, we recommend using a certified water filter for additional protection, especially for vulnerable populations like children, pregnant women, and those with compromised immune systems.
Spotted something off on this page?
Residents keep our data honest.
This form corrects our data; it does not reach WATERTOWN WATER & SEWER AUTHORITY. For a problem with your water now (discolored water, no water, low pressure, a leak), contact WATERTOWN WATER & SEWER AUTHORITY directly.
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