What was found in Denville twp.-1408's water
The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate-Nitrite | 2285 µg/L 23% of the EPA limit 10000 µg/L Main supplier: DENVILLE TWP WATER DEPT · 15,881 people · 2019
Highest in the city: 2909.5 µg/L — MOUNTAIN LAKES WATER DEP · 4,012 people · 2019 | 3/3 | SYR4 |
| Nitrate | 2450 µg/L 25% of the EPA limit 10000 µg/L Highest in the city: ROCKAWAY BORO WATER DEPT · 7,066 people · 2019 | 1/3 | SYR4 |
| Fluoride | 999.5 µg/L 25% of the EPA limit 4000 µg/L Main supplier: DENVILLE TWP WATER DEPT · 15,881 people · 2017 | 3/3 | SYR4 |
| Copper | 286 µg/L 22% of the EPA limit 1300 µg/L Main supplier: DENVILLE TWP WATER DEPT · 15,881 people · 2017
Highest in the city: 700.25 µg/L — MOUNTAIN LAKES WATER DEP · 4,012 people · 2019 | 3/3 | SYR4 |
| Barium | 20.9 µg/L 1% of the EPA limit 2000 µg/L Main supplier: DENVILLE TWP WATER DEPT · 15,881 people · 2017
Highest in the city: 173.9 µg/L — ROCKAWAY BORO WATER DEPT · 7,066 people · 2018 | 3/3 | SYR4 |
| TTHM | 5.24 µg/L 6.6% of the EPA limit 80 µg/L Main supplier: DENVILLE TWP WATER DEPT · 15,881 people · 2019
Highest in the city: 23.3 µg/L — ROCKAWAY BORO WATER DEPT · 7,066 people · 2019 | 3/3 | SYR4 |
| Bromoform | 2.6 µg/L No EPA limit set Main supplier: DENVILLE TWP WATER DEPT · 15,881 people · 2019
Highest in the city: 11.015 µg/L — ROCKAWAY BORO WATER DEPT · 7,066 people · 2019 | 3/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 10.061 µg/L 17% of the EPA limit 60 µg/L Main supplier: DENVILLE TWP WATER DEPT · 15,881 people · 2019 | 3/3 | SYR4 |
| Lead | 7.2 µg/L 48% of the EPA limit 15 µg/L Main supplier: DENVILLE TWP WATER DEPT · 15,881 people · 2017
Highest in the city: 9.5 µg/L — MOUNTAIN LAKES WATER DEP · 4,012 people · 2019 | 3/3 | SYR4 |
| Dibromochloromethane | 2 µg/L No EPA limit set Main supplier: DENVILLE TWP WATER DEPT · 15,881 people · 2019
Highest in the city: 8.601 µg/L — ROCKAWAY BORO WATER DEPT · 7,066 people · 2019 | 3/3 | SYR4 |
| Dichloroacetic Acid | 5.6 µg/L No EPA limit set Main supplier: DENVILLE TWP WATER DEPT · 15,881 people · 2019 | 3/3 | SYR4 |
| Trichloroacetic Acid | 5.56 µg/L No EPA limit set Main supplier: DENVILLE TWP WATER DEPT · 15,881 people · 2019 | 2/3 | SYR4 |
| Monobromoacetic Acid | 5.44 µg/L No EPA limit set Main supplier: DENVILLE TWP WATER DEPT · 15,881 people · 2019 | 2/3 | SYR4 |
| Monochloroacetic Acid | 5.21 µg/L No EPA limit set Main supplier: DENVILLE TWP WATER DEPT · 15,881 people · 2019 | 1/3 | SYR4 |
| Bromodichloromethane | 0.9000 µg/L No EPA limit set Main supplier: DENVILLE TWP WATER DEPT · 15,881 people · 2019
Highest in the city: 4.78 µg/L — MOUNTAIN LAKES WATER DEP · 4,012 people · 2019 | 3/3 | SYR4 |
| Dibromoacetic Acid | 2.569 µg/L No EPA limit set Main supplier: DENVILLE TWP WATER DEPT · 15,881 people · 2019
Highest in the city: 3.695 µg/L — MOUNTAIN LAKES WATER DEP · 4,012 people · 2019 | 3/3 | SYR4 |
| Dichloromethane | 2.98 µg/L 60% of the EPA limit 5 µg/L Main supplier: DENVILLE TWP WATER DEPT · 15,881 people · 2019 | 1/3 | SYR4 |
| Tetrachloroethylene | 2.8 µg/L 56% of the EPA limit 5 µg/L Main supplier: DENVILLE TWP WATER DEPT · 15,881 people · 2019 | 1/3 | SYR4 |
| Chloroform | 0.7950 µg/L No EPA limit set Main supplier: DENVILLE TWP WATER DEPT · 15,881 people · 2019
Highest in the city: 2.28 µg/L — MOUNTAIN LAKES WATER DEP · 4,012 people · 2019 | 3/3 | SYR4 |
| P-Dichlorobenzene | 1.605 µg/L 2.1% of the EPA limit 75 µg/L Main supplier: DENVILLE TWP WATER DEPT · 15,881 people · 2019 | 1/3 | SYR4 |
| Combined Radium (-226 And -228) | 1.5 pCi/L 30% of the EPA limit 5 pCi/L Main supplier: DENVILLE TWP WATER DEPT · 15,881 people · 2017
Highest in the city: 1.576 pCi/L — MOUNTAIN LAKES WATER DEP · 4,012 people · 2015 | 2/3 | SYR4 |
| Combined Uranium | 1.242 µg/L 4.1% of the EPA limit 30 µg/L Highest in the city: MOUNTAIN LAKES WATER DEP · 4,012 people · 2015 | 1/3 | SYR4 |
| Arsenic | 1 µg/L 10% of the EPA limit 10 µg/L Main supplier: DENVILLE TWP WATER DEPT · 15,881 people · 2017 | 2/3 | SYR4 |
| Chromium | 1 µg/L 1% of the EPA limit 100 µg/L Main supplier: DENVILLE TWP WATER DEPT · 15,881 people · 2017 | 2/3 | SYR4 |
| Gross Alpha, Excl. Radon And U | 0.8321 pCi/L 5.5% of the EPA limit 15 pCi/L Highest in the city: MOUNTAIN LAKES WATER DEP · 4,012 people · 2015 | 1/3 | SYR4 |
| Trichloroethylene | 0.5000 µg/L 10% of the EPA limit 5 µg/L Main supplier: DENVILLE TWP WATER DEPT · 15,881 people · 2019 | 1/3 | SYR4 |
| Mercury | 0.0350 µg/L 1.8% of the EPA limit 2 µg/L Highest in the city: ROCKAWAY BORO WATER DEPT · 7,066 people · 2018 | 1/3 | SYR4 |
| PFOA | 0.0120 µg/L No EPA limit set Main supplier: DENVILLE TWP WATER DEPT · 15,881 people · 2025
Highest in the city: 0.0142 µg/L — ROCKAWAY BORO WATER DEPT · 7,066 people · 2024 | 3/3 | UCMR-5 |
| Pfpea | 0.0087 µg/L No EPA limit set Main supplier: DENVILLE TWP WATER DEPT · 15,881 people · 2025 | 3/3 | UCMR-5 |
| PFBS | 0.0050 µg/L No EPA limit set Main supplier: DENVILLE TWP WATER DEPT · 15,881 people · 2025
Highest in the city: 0.0066 µg/L — ROCKAWAY BORO WATER DEPT · 7,066 people · 2024 | 2/3 | UCMR-5 |
| PFHXS | 0.0065 µg/L No EPA limit set Main supplier: DENVILLE TWP WATER DEPT · 15,881 people · 2025 | 2/3 | UCMR-5 |
| PFOS | 0.0044 µg/L No EPA limit set Main supplier: DENVILLE TWP WATER DEPT · 15,881 people · 2025
Highest in the city: 0.0065 µg/L — ROCKAWAY BORO WATER DEPT · 7,066 people · 2024 | 2/3 | UCMR-5 |
| Pfhxa | 0.0061 µg/L No EPA limit set Main supplier: DENVILLE TWP WATER DEPT · 15,881 people · 2025 | 2/3 | UCMR-5 |
| Pfba | 0.0057 µg/L No EPA limit set Highest in the city: ROCKAWAY BORO WATER DEPT · 7,066 people · 2024 | 1/3 | UCMR-5 |
| Pfhpa | 0.0045 µg/L No EPA limit set Main supplier: DENVILLE TWP WATER DEPT · 15,881 people · 2025 | 2/3 | UCMR-5 |
| Lead | 0.0019 mg/L 12% of the EPA limit 0.0150 mg/L Main supplier: DENVILLE TWP WATER DEPT · 15,881 people · 2026
Highest in the city: 0.0041 mg/L — ROCKAWAY BORO WATER DEPT · 7,066 people · 2026 | 3/3 | LCR |
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 the
system's samples — over 100% is worth reading, but is not by itself a
violation.
Formal violations are listed separately.
These are the utilities' own EPA-reported results, not a city-wide
average. A detection means the lab measured the
substance — it isn't the same as exceeding a legal limit. Hover a source
tag to see the EPA program and years behind each figure.
Water suppliers serving Denville twp.-1408
| Supplier | Population served |
|---|---|
| DENVILLE TWP WATER DEPT | 15,881 |
| ROCKAWAY BORO WATER DEPT | 7,066 |
| MOUNTAIN LAKES WATER DEP | 4,012 |
Frequently asked questions about Denville twp.-1408 tap water
Is Denville twp.-1408 tap water safe to drink?
EPA testing detected 36 contaminants in the water serving Denville twp.-1408. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.
How many water suppliers serve Denville twp.-1408?
3 public water suppliers report drinking-water monitoring for Denville twp.-1408, New Jersey to the EPA. Each is listed above with its population served.
What contaminants are in Denville twp.-1408's water?
The contaminants EPA monitoring detected in Denville twp.-1408 include Nitrate-Nitrite, Nitrate, Fluoride, Copper, Barium. The full list, with the level at the main supplier and the data source, is in the table above.
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.