Tap WaterIndex

← Massachusetts

Tap water quality report

Ayer Dpw Water Division

EPA monitoring tested this supplier for 103 contaminants and detected 18. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

103
contaminants tested
18
detected
8,479
people served
4
health-based violations
Massachusetts rankingsLead in MassachusettsPFAS in Massachusetts
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.

4
health-based violations
45
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2000-09-01 → 2000-09-30
MCL Health-based Resolved 2000-09-01 → 2000-09-30
MCL Health-based Resolved 2000-03-01 → 2000-03-31
MCL Health-based Resolved 2000-03-01 → 2000-03-31
MR Monitoring Resolved 2023-07-01
MR Monitoring Resolved 2023-07-01
MR Monitoring Resolved 2021-07-01
MR Monitoring Resolved 2021-07-01
MR Monitoring Resolved 2021-01-01
MR Monitoring Resolved 2021-01-01

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
Pfba 0.0199 µg/L 3/4 2024
Pfpea 0.0131 µg/L 2/4 2024
Pfhxa 0.0052 µg/L 1/4 2024

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
Copper
510.5 µg/L 39%
of the EPA limit 1300 µg/L
worst single sample: 930 µg/L
138/186 SYR4 2012–2019
Nitrate
910 µg/L 9.1%
of the EPA limit 10000 µg/L
worst single sample: 1460 µg/L
86/96 SYR4 2012–2019
Arsenic
81.4 µg/L 814%
of the EPA limit, at the 95th percentile of samples — 10 µg/L
worst single sample: 107 µg/L
74/158 SYR4 2012–2019
Lead
0.0028 mg/L 19%
of the EPA limit 0.0150 mg/L
 34/34 LCR 2025
Lead
20.6 µg/L 137%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
worst single sample: 57 µg/L
30/41 SYR4 2016
Barium
44.15 µg/L 2.2%
of the EPA limit 2000 µg/L
worst single sample: 47 µg/L
20/20 SYR4 2012–2018
Bromodichloromethane
8.546 µg/L
No EPA limit set
worst single sample: 9.11 µg/L
7/7 SYR4 2014–2019
Chloroform
16.24 µg/L
No EPA limit set
worst single sample: 16.3 µg/L
7/7 SYR4 2014–2019
TTHM
27.3 µg/L 34%
of the EPA limit 80 µg/L
worst single sample: 28.5 µg/L
7/7 SYR4 2014–2019
Dibromochloromethane
3.5975 µg/L
No EPA limit set
worst single sample: 3.71 µg/L
6/7 SYR4 2014–2019
Dichloroacetic Acid
1.715 µg/L
No EPA limit set
worst single sample: 1.77 µg/L
3/7 SYR4 2014–2019
Total Haloacetic Acids (HAA5)
8.384 µg/L 14%
of the EPA limit 60 µg/L
worst single sample: 8.56 µg/L
3/7 SYR4 2014–2019
Trichloroacetic Acid
6.683 µg/L
No EPA limit set
worst single sample: 6.79 µg/L
3/7 SYR4 2014–2019
Chromium
1 µg/L 1%
of the EPA limit 100 µg/L
 1/20 SYR4 2012–2018
Fluoride
100 µg/L 2.5%
of the EPA limit 4000 µg/L
 1/20 SYR4 2012–2018
85 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, TotalBromoformChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromoacetic AcidDinosebEthylene DibromideEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPFBSPfdaPfdoaPfeesaPfhpaPfhpsPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
KIMBERLY ABRAHAM
Phone
9787728240
Email
[email protected]

Frequently asked questions about Ayer Dpw Water Division

Is Ayer Dpw Water Division tap water safe to drink?

EPA monitoring detected 18 contaminants in Ayer Dpw Water Division'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 Ayer Dpw Water Division's water?

EPA monitoring detected Copper, Nitrate, Arsenic, Lead, Lead, and others. The full list with the level and data source for each is above.

How many people does Ayer Dpw Water Division serve?

Ayer Dpw Water Division reports serving 8,479 people in Massachusetts, per its EPA record.

Has Ayer Dpw Water Division had any water quality violations?

The EPA has 45 violations on file for Ayer Dpw Water Division, of which 4 are health-based (a contaminant limit or required treatment was breached) and 0 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.