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Tap water quality report

Montclair, CA

EPA monitoring detected 27 contaminants across the 1 water supplier serving Montclair. A detection doesn't automatically mean the water is unsafe — see the highest level found for each below, with its EPA source and period.

1
water supplier
56,017
people served
27
contaminants found
California rankings Lead in California PFAS in California

What was found in Montclair's water

The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate
20114 µg/L 201%
of the EPA limit, in the worst sample — 10000 µg/L
 1/1 SYR4
Nitrate-Nitrite
17000 µg/L 170%
of the EPA limit, in the worst sample — 10000 µg/L
 1/1 SYR4
Fluoride
300 µg/L 7.5%
of the EPA limit 4000 µg/L
 1/1 SYR4
Copper
98 µg/L 7.5%
of the EPA limit 1300 µg/L
 1/1 SYR4
TTHM
82 µg/L 102%
of the EPA limit, in the worst sample — 80 µg/L
 1/1 SYR4
Dibromochloromethane
33 µg/L
No EPA limit set
 1/1 SYR4
Bromoform
32 µg/L
No EPA limit set
 1/1 SYR4
Chloroform
24.7 µg/L
No EPA limit set
 1/1 SYR4
Bromodichloromethane
24 µg/L
No EPA limit set
 1/1 SYR4
Total Haloacetic Acids (HAA5)
18.1 µg/L 30%
of the EPA limit 60 µg/L
 1/1 SYR4
Chromium
12 µg/L 12%
of the EPA limit 100 µg/L
 1/1 SYR4
Dibromoacetic Acid
10.4 µg/L
No EPA limit set
 1/1 SYR4
Lead
8.4 µg/L 56%
of the EPA limit 15 µg/L
 1/1 SYR4
Dichloroacetic Acid
6.2 µg/L
No EPA limit set
 1/1 SYR4
Arsenic
5.9 µg/L 59%
of the EPA limit 10 µg/L
 1/1 SYR4
Trichloroacetic Acid
5 µg/L
No EPA limit set
 1/1 SYR4
Monobromoacetic Acid
1.3 µg/L
No EPA limit set
 1/1 SYR4
Tetrachloroethylene
0.6400 µg/L 13%
of the EPA limit 5 µg/L
 1/1 SYR4
Trichloroethylene
0.5800 µg/L 12%
of the EPA limit 5 µg/L
 1/1 SYR4
1,2-DIBROMO-3-CHLOROPROPANE
0.5300 µg/L 265%
of the EPA limit, in the worst sample — 0.2000 µg/L
 1/1 SYR4
1,1-Dichloroethylene
0.5200 µg/L 7.4%
of the EPA limit 7 µg/L
 1/1 SYR4
Pfba
0.0110 µg/L
No EPA limit set
 1/1 UCMR-5
PFHXS
0.0074 µg/L
No EPA limit set
 1/1 UCMR-5
PFOS
0.0056 µg/L
No EPA limit set
 1/1 UCMR-5
Pfpea
0.0035 µg/L
No EPA limit set
 1/1 UCMR-5
Pfhxa
0.0033 µg/L
No EPA limit set
 1/1 UCMR-5
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 1/1 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 single worst sample on record — 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 Montclair

SupplierPopulation served
MONTE VISTA WD 56,017

Frequently asked questions about Montclair tap water

Is Montclair tap water safe to drink?

EPA testing detected 27 contaminants in the water serving Montclair. 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 Montclair?

1 public water supplier report drinking-water monitoring for Montclair, California to the EPA. Each is listed above with its population served.

What contaminants are in Montclair's water?

The contaminants EPA monitoring detected in Montclair include Nitrate, Nitrate-Nitrite, Fluoride, Copper, TTHM. The full list, with the highest level found 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.