Tap WaterIndex

← San Dimas, CA

Tap water quality report

ZIP 91010 — San Dimas, CA

EPA monitoring across the 2 water suppliers serving ZIP 91010 in San Dimas, CA detected 24 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
51,845
people served
24
contaminants found

What was found in ZIP 91010

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-Nitrite
950000 µg/L 9500%
of the EPA limit, in the worst sample — 10000 µg/L
 2/2 SYR4
Nitrate
6328 µg/L 63%
of the EPA limit 10000 µg/L
 2/2 SYR4
Fluoride
910 µg/L 23%
of the EPA limit 4000 µg/L
 2/2 SYR4
Copper
234 µg/L 18%
of the EPA limit 1300 µg/L
 1/2 SYR4
Barium
210 µg/L 11%
of the EPA limit 2000 µg/L
 1/2 SYR4
TTHM
36 µg/L 45%
of the EPA limit 80 µg/L
 2/2 SYR4
Trichloroethylene
20 µg/L 400%
of the EPA limit, in the worst sample — 5 µg/L
 1/2 SYR4
Bromoform
14 µg/L
No EPA limit set
 2/2 SYR4
Dibromochloromethane
14 µg/L
No EPA limit set
 2/2 SYR4
Tetrachloroethylene
7.8 µg/L 156%
of the EPA limit, in the worst sample — 5 µg/L
 1/2 SYR4
Total Haloacetic Acids (HAA5)
6.8 µg/L 11%
of the EPA limit 60 µg/L
 2/2 SYR4
Bromodichloromethane
5.8 µg/L
No EPA limit set
 2/2 SYR4
Dibromoacetic Acid
5.6 µg/L
No EPA limit set
 2/2 SYR4
Combined Uranium
5.066 µg/L 17%
of the EPA limit 30 µg/L
 2/2 SYR4
Dichloromethane
3.4 µg/L 68%
of the EPA limit 5 µg/L
 1/2 SYR4
Arsenic
3.2 µg/L 32%
of the EPA limit 10 µg/L
 1/2 SYR4
Monochloroacetic Acid
2.6 µg/L
No EPA limit set
 1/2 SYR4
Chloroform
2.1 µg/L
No EPA limit set
 2/2 SYR4
Dichloroacetic Acid
1.2 µg/L
No EPA limit set
 1/2 SYR4
Trichloroacetic Acid
1.2 µg/L
No EPA limit set
 1/2 SYR4
PFOS
0.0220 µg/L
No EPA limit set
 2/2 UCMR-5
PFHXS
0.0070 µg/L
No EPA limit set
 1/2 UCMR-5
PFOA
0.0055 µg/L
No EPA limit set
 1/2 UCMR-5
Lead
0.0010 mg/L 6.7%
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 91010

SupplierStatePopulation served
GSWC-SOUTH ARCADIA CA 27,072
CAL-AM WATER COMPANY - DUARTE CA 24,773

Frequently asked questions about ZIP 91010 tap water

Is the tap water in ZIP 91010 safe to drink?

EPA testing detected 24 contaminants across the water suppliers serving ZIP 91010. 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 91010?

2 public water suppliers report EPA drinking-water monitoring for ZIP 91010. Each is listed above with its population served.

What contaminants are in ZIP 91010's water?

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