Is Montville Water Supply Tap Water Safe? Quality Report

Water source: SWP
Ownership: Local government
Counties served: New London

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	2016-01-01 → 2016-03-31
MCL	Health-based	Resolved	2016-01-01 → 2016-03-31
MCL	Health-based	Resolved	2016-01-01 → 2016-03-31
MCL	Health-based	Resolved	2016-01-01 → 2016-03-31
MCL	Health-based	Resolved	2016-01-01 → 2016-03-31
MCL	Health-based	Resolved	2015-07-01 → 2015-09-30
MCL	Health-based	Resolved	2015-07-01 → 2015-09-30
MCL	Health-based	Resolved	2015-07-01 → 2015-09-30
MCL	Health-based	Resolved	2015-07-01 → 2015-09-30
MCL	Health-based	Resolved	2015-07-01 → 2015-09-30

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
Copper	68.1 µg/L 5.2% of the EPA limit 1300 µg/L worst single sample: 83 µg/L	40/41	SYR4	2014–2019
Bromodichloromethane	21 µg/L No EPA limit set worst single sample: 22 µg/L	36/36	SYR4	2012–2019
Chloroform	70 µg/L No EPA limit set worst single sample: 80 µg/L	36/36	SYR4	2012–2019
Dibromochloromethane	7.625 µg/L No EPA limit set worst single sample: 8.8 µg/L	36/36	SYR4	2012–2019
TTHM	95.7 µg/L 120% of the EPA limit, at the 95th percentile of samples — 80 µg/L worst single sample: 102.1 µg/L	36/36	SYR4	2012–2019
Dichloroacetic Acid	18.9 µg/L No EPA limit set worst single sample: 21 µg/L	32/32	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	40 µg/L 67% of the EPA limit 60 µg/L worst single sample: 42 µg/L	32/32	SYR4	2012–2019
Trichloroacetic Acid	19 µg/L No EPA limit set worst single sample: 20 µg/L	32/32	SYR4	2012–2019
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L	18/18	LCR	2025
Dibromoacetic Acid	3.52 µg/L No EPA limit set worst single sample: 4.6 µg/L	10/32	SYR4	2012–2019
Lead	12.75 µg/L 85% of the EPA limit 15 µg/L worst single sample: 15 µg/L	7/41	SYR4	2014–2019
Monochloroacetic Acid	5.25 µg/L No EPA limit set worst single sample: 5.3 µg/L	3/32	SYR4	2012–2019
Bromoform	0.8630 µg/L No EPA limit set worst single sample: 0.8700 µg/L	2/36	SYR4	2012–2019

1 contaminants tested, none detected

Monobromoacetic Acid

Utility contact

Contact: MCDANIEL, RONALD K.
Phone: 860-848-6711
Email: [email protected]

Frequently asked questions about Montville Water Supply

Is Montville Water Supply tap water safe to drink?

EPA monitoring detected 13 contaminants in Montville Water Supply'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 Montville Water Supply's water?

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

How many people does Montville Water Supply serve?

Montville Water Supply reports serving 1,300 people in Connecticut, per its EPA record.

Has Montville Water Supply had any water quality violations?

The EPA has 87 violations on file for Montville Water Supply, of which 15 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.