Is Denville Twp Water Dept Tap Water Safe? Quality Report

Water source: Ground water
Ownership: Local government
Counties served: Morris

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

506

violations on file

still open

Violation	Type	Status	Period
MCL	Health-based	Resolved	1993-01-01 → 1993-12-31
MCL	Health-based	Resolved	1993-01-01 → 1993-12-31
MCL	Health-based	Resolved	1993-01-01 → 1993-12-31
MR	Monitoring	Resolved	2025-01-01 → 2025-12-31
MR	Monitoring	Resolved	2025-01-01 → 2025-12-31
MR	Monitoring	Resolved	2025-01-01 → 2025-12-31
MR	Monitoring	Resolved	2025-01-01 → 2025-12-31
MR	Monitoring	Resolved	2025-01-01 → 2025-12-31
MR	Monitoring	Resolved	2025-01-01 → 2025-12-31
MR	Monitoring	Resolved	2025-01-01 → 2025-12-31

PFAS detected

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

Contaminant	Max	Detection rate	Period
PFOA	0.0120 µg/L	8/10	2025
Pfpea	0.0087 µg/L	6/10	2025
Pfhxa	0.0061 µg/L	5/10	2025
PFBS	0.0050 µg/L	4/10	2025
PFHXS	0.0065 µg/L	4/10	2025
PFOS	0.0044 µg/L	3/10	2025
Pfhpa	0.0045 µg/L	2/10	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
TTHM	5.24 µg/L 6.6% of the EPA limit 80 µg/L worst single sample: 12.3 µg/L	95/128	SYR4	2012–2019
Dibromochloromethane	2 µg/L No EPA limit set worst single sample: 3.8 µg/L	93/213	SYR4	2012–2019
Bromoform	2.6 µg/L No EPA limit set worst single sample: 7.6 µg/L	89/213	SYR4	2012–2019
Nitrate-Nitrite	2285 µg/L 23% of the EPA limit 10000 µg/L worst single sample: 2420 µg/L	64/64	SYR4	2012–2019
Copper	286 µg/L 22% of the EPA limit 1300 µg/L worst single sample: 1140 µg/L	56/68	SYR4	2014–2017
Lead	7.2 µg/L 48% of the EPA limit 15 µg/L worst single sample: 484 µg/L	29/60	SYR4	2014–2017
Lead	0.0019 mg/L 12% of the EPA limit 0.0150 mg/L	28/28	LCR	2026
Bromodichloromethane	0.9000 µg/L No EPA limit set worst single sample: 1.1 µg/L	21/213	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	10.061 µg/L 17% of the EPA limit 60 µg/L worst single sample: 12 µg/L	15/128	SYR4	2012–2019
P-Dichlorobenzene	1.605 µg/L 2.1% of the EPA limit 75 µg/L worst single sample: 1.8 µg/L	14/85	SYR4	2012–2019
Dibromoacetic Acid	2.569 µg/L No EPA limit set worst single sample: 2.8 µg/L	12/128	SYR4	2012–2019
Fluoride	999.5 µg/L 25% of the EPA limit 4000 µg/L worst single sample: 1040 µg/L	10/16	SYR4	2014–2017
Barium	20.9 µg/L 1% of the EPA limit 2000 µg/L worst single sample: 23 µg/L	8/8	SYR4	2014–2017
Chromium	1 µg/L 1% of the EPA limit 100 µg/L	8/8	SYR4	2014–2017
Combined Radium (-226 And -228)	1.5 pCi/L 30% of the EPA limit 5 pCi/L	4/4	SYR4	2017
Dichloromethane	2.98 µg/L 60% of the EPA limit 5 µg/L worst single sample: 3.2 µg/L	3/85	SYR4	2012–2019
Dichloroacetic Acid	5.6 µg/L No EPA limit set worst single sample: 6 µg/L	3/128	SYR4	2012–2019
Trichloroacetic Acid	5.56 µg/L No EPA limit set worst single sample: 5.7 µg/L	3/128	SYR4	2012–2019
Trichloroethylene	0.5000 µg/L 10% of the EPA limit 5 µg/L	3/85	SYR4	2012–2019
Arsenic	1 µg/L 10% of the EPA limit 10 µg/L	2/8	SYR4	2014–2017
Chloroform	0.7950 µg/L No EPA limit set worst single sample: 0.8000 µg/L	2/213	SYR4	2012–2019
Monobromoacetic Acid	5.44 µg/L No EPA limit set	1/128	SYR4	2012–2019
Monochloroacetic Acid	5.21 µg/L No EPA limit set	1/128	SYR4	2012–2019
Tetrachloroethylene	2.8 µg/L 56% of the EPA limit 5 µg/L	1/85	SYR4	2012–2019

49 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalBenzeneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbon TetrachlorideEthylene DibromideEthylbenzeneHfpo-DaMercuryNetfosaaNfdhaNmefosaaPfbaPfdaPfdoaPfeesaPfhpsPfmbaPfmpaPFNAPfpesPftaPftrdaPfunaSeleniumStyreneThallium, TotalTolueneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: EQBERT, JOHN
Phone: 973-625-8334

Frequently asked questions about Denville Twp Water Dept

Is Denville Twp Water Dept tap water safe to drink?

EPA monitoring detected 31 contaminants in Denville Twp 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 Denville Twp Water Dept's water?

EPA monitoring detected TTHM, Dibromochloromethane, Bromoform, Nitrate-Nitrite, Copper, and others. The full list with the level and data source for each is above.

How many people does Denville Twp Water Dept serve?

Denville Twp Water Dept reports serving 15,881 people in New Jersey, per its EPA record.

Has Denville Twp Water Dept had any water quality violations?

The EPA has 506 violations on file for Denville Twp Water Dept, of which 3 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.