Is Wilmington Water Dept Tap Water Safe? Quality Report

Water source: SWP
Ownership: Local government
Counties served: Middlesex

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.

health-based violations

violations on file

still open

Violation	Type	Status	Period
MCL	Health-based	Resolved	2022-09-01 → 2022-09-30
MCL	Health-based	Resolved	2022-09-01 → 2022-09-30
MCL	Health-based	Archived	2002-10-01 → 2002-12-31
MCL	Health-based	Archived	1998-11-01 → 1998-11-30
TT	Health-based	Resolved	1993-01-01
TT	Health-based	Resolved	1993-01-01
MCL	Health-based	Archived	1991-06-01 → 1991-06-30
MR	Monitoring	Archived	2014-10-01 → 2014-12-31
MR	Monitoring	Unaddressed	2013-01-01
MR	Monitoring	Resolved	2010-06-01 → 2010-09-30

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).

Contaminant	Max	Detection rate	Period
Pfba	0.0088 µg/L	2/10	2025
Pfpea	0.0030 µg/L	1/10	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.

Contaminant	Level vs EPA limit	Detection rate	Source	Period
Nitrate	1192.5 µg/L 12% of the EPA limit 10000 µg/L worst single sample: 2310 µg/L	156/280	SYR4	2012–2019
TTHM	86.385 µg/L 108% of the EPA limit, at the 95th percentile of samples — 80 µg/L worst single sample: 100 µg/L	124/125	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	46.6 µg/L 78% of the EPA limit 60 µg/L worst single sample: 80 µg/L	99/124	SYR4	2012–2019
Arsenic	44.455 µg/L 445% of the EPA limit, at the 95th percentile of samples — 10 µg/L worst single sample: 69.5 µg/L	74/124	SYR4	2012–2019
Nitrite	330.5 µg/L 33% of the EPA limit 1000 µg/L worst single sample: 432 µg/L	52/125	SYR4	2012–2019
Barium	36 µg/L 1.8% of the EPA limit 2000 µg/L worst single sample: 39.1 µg/L	24/25	SYR4	2012–2019
Bromodichloromethane	24.7 µg/L No EPA limit set worst single sample: 25 µg/L	24/25	SYR4	2018–2019
Chloroform	59.7 µg/L No EPA limit set worst single sample: 70 µg/L	24/25	SYR4	2018–2019
Dibromochloromethane	10.89 µg/L No EPA limit set worst single sample: 12 µg/L	24/25	SYR4	2018–2019
Lead	0.0018 mg/L 12% of the EPA limit 0.0150 mg/L	21/21	LCR	2025
Dichloroacetic Acid	21.4 µg/L No EPA limit set worst single sample: 35 µg/L	17/24	SYR4	2018–2019
Trichloroacetic Acid	32.5 µg/L No EPA limit set worst single sample: 40 µg/L	16/24	SYR4	2018–2019
Dibromoacetic Acid	3.52 µg/L No EPA limit set worst single sample: 3.7 µg/L	13/24	SYR4	2018–2019
Monochloroacetic Acid	4.25 µg/L No EPA limit set worst single sample: 4.8 µg/L	11/24	SYR4	2018–2019
Bromoform	1.731 µg/L No EPA limit set worst single sample: 1.92 µg/L	10/25	SYR4	2018–2019
Monobromoacetic Acid	1.1275 µg/L No EPA limit set worst single sample: 1.14 µg/L	6/24	SYR4	2018–2019
Chromium	1.54 µg/L 1.5% of the EPA limit 100 µg/L worst single sample: 1.6 µg/L	4/25	SYR4	2012–2019
Vinyl Chloride	0.6140 µg/L 31% of the EPA limit 2 µg/L worst single sample: 0.6200 µg/L	2/49	SYR4	2012–2019
Di(2-ethylhexyl) Phthalate	0.9130 µg/L 15% of the EPA limit 6 µg/L	1/42	SYR4	2013–2019
Styrene	0.5600 µg/L 0.6% of the EPA limit 100 µg/L	1/49	SYR4	2012–2019
cis-1,2-Dichloroethylene	0.6400 µg/L 0.9% of the EPA limit 70 µg/L	1/49	SYR4	2012–2019

79 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, TotalAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCopperCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDinosebEthylene DibromideEndrinEthylbenzeneFluorideHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaOxamylPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneXylenes, TotalLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: JOSEPH L LOBAO
Phone: 9786584711
Email: [email protected]

Frequently asked questions about Wilmington Water Dept

Is Wilmington Water Dept tap water safe to drink?

EPA monitoring detected 23 contaminants in Wilmington Water Dept'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 Wilmington Water Dept's water?

EPA monitoring detected Nitrate, TTHM, Total Haloacetic Acids (HAA5), Arsenic, Nitrite, and others. The full list with the level and data source for each is above.

How many people does Wilmington Water Dept serve?

Wilmington Water Dept reports serving 21,654 people in Massachusetts, per its EPA record.

Has Wilmington Water Dept had any water quality violations?

The EPA has 53 violations on file for Wilmington Water Dept, of which 7 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.