Tap WaterIndex

← Pomona, CA

Tap water quality report

ZIP 91766 — Pomona, CA

EPA monitoring across the 2 water suppliers serving ZIP 91766 in Pomona, CA detected 34 contaminants. A detection doesn't automatically mean the water is unsafe — see the highest level found below, with the EPA limit for each.

2
water suppliers
207,730
people served
34
contaminants found

What was found in ZIP 91766

The highest level seen across the suppliers serving this ZIP, the EPA limit for each, and where the figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate
29000 µg/L 290%
of the EPA limit, in the worst sample — 10000 µg/L
 2/2 SYR4
Nitrate-Nitrite
22000 µg/L 220%
of the EPA limit, in the worst sample — 10000 µg/L
 2/2 SYR4
Fluoride
600 µg/L 15%
of the EPA limit 4000 µg/L
 2/2 SYR4
Chromium
180 µg/L 180%
of the EPA limit, in the worst sample — 100 µg/L
 2/2 SYR4
Trichloroethylene
130 µg/L 2600%
of the EPA limit, in the worst sample — 5 µg/L
 2/2 SYR4
Barium
100 µg/L 5%
of the EPA limit 2000 µg/L
 1/2 SYR4
Copper
98 µg/L 7.5%
of the EPA limit 1300 µg/L
 1/2 SYR4
TTHM
82 µg/L 102%
of the EPA limit, in the worst sample — 80 µg/L
 2/2 SYR4
1,1-Dichloroethylene
61 µg/L 871%
of the EPA limit, in the worst sample — 7 µg/L
 2/2 SYR4
Tetrachloroethylene
34 µg/L 680%
of the EPA limit, in the worst sample — 5 µg/L
 2/2 SYR4
Dibromochloromethane
33 µg/L
No EPA limit set
 2/2 SYR4
Bromoform
32 µg/L
No EPA limit set
 2/2 SYR4
Total Haloacetic Acids (HAA5)
27 µg/L 45%
of the EPA limit 60 µg/L
 2/2 SYR4
Chloroform
25 µg/L
No EPA limit set
 2/2 SYR4
Bromodichloromethane
24 µg/L
No EPA limit set
 2/2 SYR4
Dichloroacetic Acid
16 µg/L
No EPA limit set
 2/2 SYR4
Trichloroacetic Acid
12 µg/L
No EPA limit set
 2/2 SYR4
Arsenic
11 µg/L 110%
of the EPA limit, in the worst sample — 10 µg/L
 2/2 SYR4
Dibromoacetic Acid
10.4 µg/L
No EPA limit set
 2/2 SYR4
Lithium
9.3 µg/L
No EPA limit set
 1/2 UCMR-5
Lead
8.4 µg/L 56%
of the EPA limit 15 µg/L
 1/2 SYR4
Selenium
7.2 µg/L 14%
of the EPA limit 50 µg/L
 1/2 SYR4
Combined Uranium
7.003 µg/L 23%
of the EPA limit 30 µg/L
 1/2 SYR4
Monobromoacetic Acid
2.4 µg/L
No EPA limit set
 2/2 SYR4
Thallium, Total
1.2 µg/L 60%
of the EPA limit 2 µg/L
 1/2 SYR4
1,2-DIBROMO-3-CHLOROPROPANE
0.5300 µg/L 265%
of the EPA limit, in the worst sample — 0.2000 µg/L
 2/2 SYR4
PFOS
0.0180 µg/L
No EPA limit set
 2/2 UCMR-5
Pfba
0.0110 µg/L
No EPA limit set
 1/2 UCMR-5
PFHXS
0.0079 µg/L
No EPA limit set
 2/2 UCMR-5
PFOA
0.0071 µg/L
No EPA limit set
 1/2 UCMR-5
Pfpea
0.0044 µg/L
No EPA limit set
 2/2 UCMR-5
Pfhxa
0.0041 µg/L
No EPA limit set
 2/2 UCMR-5
PFBS
0.0032 µg/L
No EPA limit set
 1/2 UCMR-5
Lead
0.0021 mg/L 14%
of the EPA limit 0.0150 mg/L
 2/2 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.

Water suppliers serving ZIP 91766

SupplierStatePopulation served
POMONA - CITY, WATER DEPT. CA 151,713
MONTE VISTA WD CA 56,017

Frequently asked questions about ZIP 91766 tap water

Is the tap water in ZIP 91766 safe to drink?

EPA testing detected 34 contaminants across the water suppliers serving ZIP 91766. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and your utility's annual Consumer Confidence Report for the official status.

Which water suppliers serve ZIP 91766?

2 public water suppliers report EPA drinking-water monitoring for ZIP 91766. Each is listed above with its population served.

What contaminants are in ZIP 91766's water?

EPA monitoring detected Nitrate, Nitrate-Nitrite, Fluoride, Chromium, Trichloroethylene, and others across this ZIP's suppliers. The full list with levels and sources is above.