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Tap water quality report

Mci Shirley

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
3,500
people served
16
health-based violations
Massachusetts rankingsLead in MassachusettsPFAS in Massachusetts
Water source
Ground water
Ownership
State 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.

16
health-based violations
156
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2007-12-01 → 2007-12-31
MCL Health-based Resolved 2007-12-01 → 2007-12-31
MCL Health-based Resolved 2007-11-01 → 2007-11-30
MCL Health-based Resolved 2007-11-01 → 2007-11-30
MCL Health-based Archived 2006-07-01 → 2006-09-30
MCL Health-based Archived 2004-08-01 → 2004-08-31
MCL Health-based Archived 2003-12-01 → 2003-12-31
TT Health-based Resolved 2003-01-01
TT Health-based Resolved 2003-01-01
TT Health-based Resolved 2003-01-01

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
PFHXS 0.0087 µg/L 2/2 2023

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
Arsenic
11 µg/L 110%
of the EPA limit, at the 95th percentile of samples — 10 µg/L
worst single sample: 13 µg/L
43/88 SYR4 2012–2019
Nitrate
982 µg/L 9.8%
of the EPA limit 10000 µg/L
worst single sample: 1400 µg/L
40/40 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 22/22 LCR 2025
Bromodichloromethane
3.46 µg/L
No EPA limit set
worst single sample: 3.5 µg/L
9/9 SYR4 2013–2019
Chloroform
2.78 µg/L
No EPA limit set
worst single sample: 2.9 µg/L
9/9 SYR4 2013–2019
Dibromochloromethane
4.6 µg/L
No EPA limit set
worst single sample: 5 µg/L
9/9 SYR4 2013–2019
TTHM
14.02 µg/L 18%
of the EPA limit 80 µg/L
worst single sample: 15.5 µg/L
9/9 SYR4 2013–2019
Bromoform
4.05 µg/L
No EPA limit set
worst single sample: 4.8 µg/L
7/9 SYR4 2013–2019
Total Haloacetic Acids (HAA5)
2.3 µg/L 3.8%
of the EPA limit 60 µg/L
worst single sample: 2.6 µg/L
6/9 SYR4 2013–2019
Barium
15.8 µg/L 0.8%
of the EPA limit 2000 µg/L
worst single sample: 16 µg/L
5/7 SYR4 2013–2019
Dibromoacetic Acid
2.48 µg/L
No EPA limit set
worst single sample: 2.6 µg/L
3/9 SYR4 2013–2019
Copper
42.65 µg/L 3.3%
of the EPA limit 1300 µg/L
worst single sample: 44 µg/L
2/3 SYR4 2012
Fluoride
80 µg/L 2%
of the EPA limit 4000 µg/L
 2/10 SYR4 2012–2019
Dichloroacetic Acid
1.2 µg/L
No EPA limit set
 1/9 SYR4 2013–2019
Monochloroacetic Acid
1.1 µg/L
No EPA limit set
 1/9 SYR4 2013–2019
Selenium
3 µg/L 6%
of the EPA limit 50 µg/L
 1/7 SYR4 2013–2019
Trichloroacetic Acid
1.2 µg/L
No EPA limit set
 1/9 SYR4 2013–2019
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, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebEthylene DibromideEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
MICHAEL DELANEY
Phone
5085415301
Email
[email protected]

Frequently asked questions about Mci Shirley

Is Mci Shirley tap water safe to drink?

EPA monitoring detected 18 contaminants in Mci Shirley'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 Mci Shirley's water?

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

How many people does Mci Shirley serve?

Mci Shirley reports serving 3,500 people in Massachusetts, per its EPA record.

Has Mci Shirley had any water quality violations?

The EPA has 156 violations on file for Mci Shirley, of which 16 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.