What was found in Rosemead's water
The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate-Nitrite | 950000 µg/L 9500% of the EPA limit, in the worst sample — 10000 µg/L | 6/8 | SYR4 |
| Nitrate | 16600 µg/L 166% of the EPA limit, in the worst sample — 10000 µg/L | 8/8 | SYR4 |
| Fluoride | 1700 µg/L 43% of the EPA limit 4000 µg/L | 8/8 | SYR4 |
| Copper | 234 µg/L 18% of the EPA limit 1300 µg/L | 3/8 | SYR4 |
| Barium | 210 µg/L 11% of the EPA limit 2000 µg/L | 4/8 | SYR4 |
| Lithium | 91.9 µg/L No EPA limit set | 2/8 | UCMR-5 |
| TTHM | 82.7 µg/L 103% of the EPA limit, in the worst sample — 80 µg/L | 7/8 | SYR4 |
| Bromoform | 52.6 µg/L No EPA limit set | 7/8 | SYR4 |
| Chromium | 44 µg/L 44% of the EPA limit 100 µg/L | 4/8 | SYR4 |
| Combined Uranium | 40.23 µg/L 134% of the EPA limit, in the worst sample — 30 µg/L | 8/8 | SYR4 |
| Carbon Tetrachloride | 40 µg/L 800% of the EPA limit, in the worst sample — 5 µg/L | 2/8 | SYR4 |
| Trichloroethylene | 39 µg/L 780% of the EPA limit, in the worst sample — 5 µg/L | 5/8 | SYR4 |
| Dibromochloromethane | 30.3 µg/L No EPA limit set | 6/8 | SYR4 |
| Total Haloacetic Acids (HAA5) | 29 µg/L 48% of the EPA limit 60 µg/L | 6/8 | SYR4 |
| Bromodichloromethane | 17.7 µg/L No EPA limit set | 6/8 | SYR4 |
| Tetrachloroethylene | 17 µg/L 340% of the EPA limit, in the worst sample — 5 µg/L | 4/8 | SYR4 |
| Chloroform | 15.9 µg/L No EPA limit set | 5/8 | SYR4 |
| Trichloroacetic Acid | 13 µg/L No EPA limit set | 4/8 | SYR4 |
| Dichloroacetic Acid | 12 µg/L No EPA limit set | 4/8 | SYR4 |
| Dibromoacetic Acid | 9.1 µg/L No EPA limit set | 6/8 | SYR4 |
| Lead | 8 µg/L 53% of the EPA limit 15 µg/L | 2/8 | SYR4 |
| Selenium | 7 µg/L 14% of the EPA limit 50 µg/L | 1/8 | SYR4 |
| Monochloroacetic Acid | 6.5 µg/L No EPA limit set | 2/8 | SYR4 |
| Arsenic | 6 µg/L 60% of the EPA limit 10 µg/L | 5/8 | SYR4 |
| Gross Beta Particle Activity | 4.6 pCi/L No EPA limit set | 1/8 | SYR4 |
| 1,2-Dichloropropane | 2.9 µg/L 58% of the EPA limit 5 µg/L | 1/8 | SYR4 |
| Monobromoacetic Acid | 2.6 µg/L No EPA limit set | 1/8 | SYR4 |
| 1,1-Dichloroethylene | 2.3 µg/L 33% of the EPA limit 7 µg/L | 1/8 | SYR4 |
| Mercury | 2.1 µg/L 105% of the EPA limit, in the worst sample — 2 µg/L | 1/8 | SYR4 |
| cis-1,2-Dichloroethylene | 1.1 µg/L 1.6% of the EPA limit 70 µg/L | 1/8 | SYR4 |
| trans-1,2-Dichloroethylene | 0.5300 µg/L 0.5% of the EPA limit 100 µg/L | 1/8 | SYR4 |
| PFOS | 0.0326 µg/L No EPA limit set | 2/8 | UCMR-5 |
| PFOA | 0.0076 µg/L No EPA limit set | 1/8 | UCMR-5 |
| PFHXS | 0.0056 µg/L No EPA limit set | 1/8 | UCMR-5 |
| Pfba | 0.0053 µg/L No EPA limit set | 2/8 | UCMR-5 |
| Lead | 0.0030 mg/L 20% of the EPA limit 0.0150 mg/L | 8/8 | LCR |
Water suppliers serving Rosemead
| Supplier | Population served |
|---|---|
| CAL/AM WATER COMPANY - SAN MARINO | 47,995 |
| SAN GABRIEL COUNTY WD | 39,345 |
| CAL-AM WATER COMPANY - DUARTE | 24,773 |
| CAL/AM WATER COMPANY - BALDWIN HILLS | 20,724 |
| CAL-AM WATER COMPANY - EAST PASADENA | 9,949 |
| BELLFLOWER MUNICIPAL WATER SYSTEM | 5,999 |
| AMARILLO MUTUAL WATER COMPANY | 3,134 |
| GOLDEN SANDS MOBILE HOME PARK | 450 |
Frequently asked questions about Rosemead tap water
Is Rosemead tap water safe to drink?
EPA testing detected 36 contaminants in the water serving Rosemead. 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 Rosemead?
8 public water suppliers report drinking-water monitoring for Rosemead, California to the EPA. Each is listed above with its population served.
What contaminants are in Rosemead's water?
The contaminants EPA monitoring detected in Rosemead include Nitrate-Nitrite, Nitrate, Fluoride, Copper, Barium. 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.