Is Waterbury, CT tap water safe?
The short answer
None of the 4 utilities serving Waterbury has a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and CDC’s records.
Waterbury Water Department, which serves the most people here, has 1 result above the health goal. The worst: Arsenic at 1.0 ppb, above the health goal. Health goals are stricter than legal limits and are not enforced.
A town can be served by more than one utility, and some homes are on private wells. The name on your water bill tells you which is yours, and your ZIP code narrows it down. They are listed by how many people each serves in Waterbury’s ZIP codes, from EPA’s estimates.
- Open report
Waterbury Water Department
Connecticut · serves 107,271 people · nearly all in Waterbury
1 result above the health goal. The worst: Arsenic at 1.0 ppb, above the health goal.
No health-based violations since 2016
- Open report
Watertown Water & Sewer Authority
Connecticut · serves 9,972 people · about 2,200 in Waterbury
1 result above the health goal. The worst: Lead at 2.0 ppb, above the health goal.
No health-based violations since 2016
- Open report
Ctwc - Naugatuck Region - Central System
Connecticut · serves 22,735 people · about 120 in Waterbury
Nothing in its records is above a health goal.
No health-based violations since 2016
- Open report
Wolcott Water Department
Connecticut · serves 2,550 people · lists Waterbury among the places it serves
Nothing in its records is above a health goal.
No health-based violations since 2016
What handles it
Each of these is certified, on a certifier’s listing, for a result above a line in Waterbury Water Department’s water, which serves the most people here. Another utility’s report names what handles its own results.
Disclosure: TapBuff earns a commission if you buy through some links on this page. It does not change which standard or filter we name. As an Amazon Associate, TapBuff earns from qualifying purchases. How TapBuff makes money
Countertop reverse osmosis
- IAPMO listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 4, 2026
Certified for: Arsenic
Aquasana SmartFlow Reverse Osmosis (AQ-SFRO2)
Under-sink reverse osmosis
- WQA listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 9, 2026
Certified for: Arsenic
Brondell Capella RC250 Reverse Osmosis System
Under-sink reverse osmosis
- WQA listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 9, 2026
Certified for: Arsenic
Water testing near Waterbury
The 3 labs Connecticut certifies closest to Waterbury, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Northwest Environmental Water Labs
Waterbury, CT · about 2 miles
Certified for bacteria, nitrate, metals, minerals and other inorganics
EMSL Analytical, Inc. - CT
Meriden, CT · about 11 miles
Certified for bacteria, asbestos
Aquatek Labs, Inc.
Woodbridge, CT · about 14 miles
Certified for bacteria, nitrate, metals, minerals and other inorganics, organic chemicals, radioactivity
Which ZIP codes are in Waterbury: Census 2020 relationship files. Which utilities serve them, and how many people: EPA SDWIS and EPA’s service area map. Each utility’s results: EPA UCMR 5, EPA SDWIS, and EPA’s and the state’s compliance monitoring, as its report lists them. How they are measured: methodology. Certified labs: Connecticut DPH, approved commercial laboratories certified to test drinking water; distances from the Census 2020 ZIP code tabulation area gazetteer.
Near Waterbury
Other towns in New Haven County with a page of their own.
What to do next
- Read Waterbury Water Department’s full reportEvery result with its dates, the violations, and the certification claim that handles each finding.Open the report
- Filters for ArsenicRanked by certification and what they cost over five years.The best reverse osmosis systems, ranked
- On a private well?No utility tests a well. A certified lab test is the first step.How to test well water