Is North Chelmsford Water Dist Tap Water Safe? Quality Report

Water source: Ground water
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
Other	Monitoring	Unaddressed	2025-07-02
MR	Monitoring	Addressed	2025-01-01
MR	Monitoring	Resolved	2012-04-01 → 2012-06-30
MR	Monitoring	Resolved	2012-04-01 → 2012-06-30
MR	Monitoring	Resolved	2009-01-01 → 2009-01-31
MR	Monitoring	Resolved	2009-01-01 → 2009-01-31
MR	Monitoring	Resolved	2009-01-01
MR	Monitoring	Resolved	2009-01-01
MR	Monitoring	Archived	2008-01-01 → 2008-03-31
MR	Monitoring	Archived	1995-05-01 → 1995-05-31

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
Chlorite	445 µg/L 45% of the EPA limit 1000 µg/L worst single sample: 650 µg/L	211/234	SYR4	2012–2019
Copper	90 µg/L 6.9% of the EPA limit 1300 µg/L worst single sample: 140 µg/L	27/43	SYR4	2012–2019
Bromodichloromethane	21.825 µg/L No EPA limit set worst single sample: 23 µg/L	24/24	SYR4	2012–2019
Chloroform	24 µg/L No EPA limit set worst single sample: 81.3 µg/L	24/24	SYR4	2012–2019
Dibromochloromethane	21.34 µg/L No EPA limit set worst single sample: 22.6 µg/L	24/24	SYR4	2012–2019
TTHM	65.16 µg/L 81% of the EPA limit 80 µg/L worst single sample: 93.9 µg/L	24/24	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	10.765 µg/L 18% of the EPA limit 60 µg/L worst single sample: 11.5 µg/L	24/24	SYR4	2012–2019
Bromoform	13.568 µg/L No EPA limit set worst single sample: 14.6 µg/L	23/24	SYR4	2012–2019
Lead	0.0035 mg/L 23% of the EPA limit 0.0150 mg/L	21/21	LCR	2025
Nitrate	930 µg/L 9.3% of the EPA limit 10000 µg/L	16/16	SYR4	2012–2019
Trichloroacetic Acid	7.0475 µg/L No EPA limit set worst single sample: 8.69 µg/L	16/24	SYR4	2012–2019
Dichloroacetic Acid	4.734 µg/L No EPA limit set worst single sample: 5.93 µg/L	14/24	SYR4	2012–2019
Dibromoacetic Acid	3.11 µg/L No EPA limit set worst single sample: 3.25 µg/L	11/24	SYR4	2012–2019
Combined Uranium	17.355 µg/L 58% of the EPA limit 30 µg/L worst single sample: 17.7 µg/L	4/4	SYR4	2018–2019
Barium	37.85 µg/L 1.9% of the EPA limit 2000 µg/L worst single sample: 38 µg/L	2/2	SYR4	2012–2018
Monobromoacetic Acid	2.647 µg/L No EPA limit set worst single sample: 2.66 µg/L	2/24	SYR4	2012–2019
Monochloroacetic Acid	1.3655 µg/L No EPA limit set worst single sample: 1.38 µg/L	2/24	SYR4	2012–2019
Lithium	30.8 µg/L No EPA limit set	2/2	UCMR-5	2024
Arsenic	2 µg/L 20% of the EPA limit 10 µg/L	1/2	SYR4	2012–2018
Fluoride	500 µg/L 13% of the EPA limit 4000 µg/L	1/2	SYR4	2012–2018

84 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, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebEthylene DibromideEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: AURORA BAS
Phone: 9782513931
Email: [email protected]

Frequently asked questions about North Chelmsford Water Dist

Is North Chelmsford Water Dist tap water safe to drink?

EPA monitoring detected 20 contaminants in North Chelmsford Water Dist'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 North Chelmsford Water Dist's water?

EPA monitoring detected Chlorite, Copper, Bromodichloromethane, Chloroform, Dibromochloromethane, and others. The full list with the level and data source for each is above.

How many people does North Chelmsford Water Dist serve?

North Chelmsford Water Dist reports serving 7,660 people in Massachusetts, per its EPA record.

Has North Chelmsford Water Dist had any water quality violations?

The EPA has 12 violations on file for North Chelmsford Water Dist, of which 0 are health-based (a contaminant limit or required treatment was breached) and 2 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.