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Tap water quality report

Westerly Water Department

EPA monitoring tested this supplier for 97 contaminants and detected 17. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

97
contaminants tested
17
detected
35,298
people served
51
health-based violations
Rhode Island rankingsLead in Rhode IslandPFAS in Rhode Island
Water source
Ground water
Ownership
Local government
Counties served
Washington

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

51
health-based violations
346
violations on file
1
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2012-05-01 → 2012-05-31
MCL Health-based Resolved 2012-05-01 → 2012-05-31
MCL Health-based Resolved 2012-05-01 → 2012-05-31
MCL Health-based Resolved 2012-05-01 → 2012-05-31
MCL Health-based Resolved 2012-05-01 → 2012-05-31
MCL Health-based Resolved 2000-12-01 → 2000-12-31
MCL Health-based Resolved 2000-12-01 → 2000-12-31
MCL Health-based Resolved 2000-12-01 → 2000-12-31
MCL Health-based Resolved 2000-12-01 → 2000-12-31
MCL Health-based Resolved 2000-12-01 → 2000-12-31

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
PFOA 0.0090 µg/L 7/14 2025
Pfhxa 0.0050 µg/L 6/14 2025
PFOS 0.0070 µg/L 5/14 2025
PFBS 0.0030 µg/L 4/14 2025
Pfpea 0.0060 µg/L 4/14 2025
Pfba 0.0100 µg/L 1/14 2025
Pfhpa 0.0030 µg/L 1/14 2025

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Nitrate
3022.5 µg/L 30%
of the EPA limit 10000 µg/L
worst single sample: 4230 µg/L
194/194 SYR4 2012–2019
Nitrate-Nitrite
2664 µg/L 27%
of the EPA limit 10000 µg/L
worst single sample: 3390 µg/L
53/53 SYR4 2013–2019
Lead
0.0051 mg/L 34%
of the EPA limit 0.0150 mg/L
 29/29 LCR 2025
Barium
80.2 µg/L 4%
of the EPA limit 2000 µg/L
worst single sample: 96 µg/L
25/25 SYR4 2013–2017
TTHM
35.895 µg/L 45%
of the EPA limit 80 µg/L
worst single sample: 47.2 µg/L
18/18 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
19.145 µg/L 32%
of the EPA limit 60 µg/L
worst single sample: 24.5 µg/L
18/18 SYR4 2012–2019
Fluoride
178.5 µg/L 4.5%
of the EPA limit 4000 µg/L
worst single sample: 180 µg/L
2/25 SYR4 2013–2017
Beryllium, Total
0.3000 µg/L 7.5%
of the EPA limit 4 µg/L
 1/25 SYR4 2013–2017
Combined Radium (-226 And -228)
0.9200 pCi/L 18%
of the EPA limit 5 pCi/L
 1/17 SYR4 2013–2017
Gross Alpha, Excl. Radon And U
3.12 pCi/L 21%
of the EPA limit 15 pCi/L
 1/6 SYR4 2013–2014
80 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicAtrazineBhc-GammaBenzeneBenzo(A)PyreneChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebEthylene DibromideEndrinEthylbenzeneGross Beta Particle ActivityHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfdaPfdoaPfeesaPfhpsPFHXSPfmbaPfmpaPFNAPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
SPOSATO, MAX (MASSIMO)
Phone
401-348-2561
Email
[email protected]

Frequently asked questions about Westerly Water Department

Is Westerly Water Department tap water safe to drink?

EPA monitoring detected 17 contaminants in Westerly Water Department's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Westerly Water Department's water?

EPA monitoring detected Nitrate, Nitrate-Nitrite, Lead, Barium, TTHM, and others. The full list with the level and data source for each is above.

How many people does Westerly Water Department serve?

Westerly Water Department reports serving 35,298 people in Rhode Island, per its EPA record.

Has Westerly Water Department had any water quality violations?

The EPA has 346 violations on file for Westerly Water Department, of which 51 are health-based (a contaminant limit or required treatment was breached) and 1 remain open. The rest are monitoring or reporting failures.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.