Water Quality: Rosemead, CA
14 water systems • 225,071 people served
Multiple Health ViolationsWater Quality Summary
Rosemead is served by 14 public water systems with a combined service population of 225,071 people, and has 48 EPA Safe Drinking Water Act violations on record. Critically, 5 of those are health-based violations, meaning one or more contaminants were detected above EPA-established safe levels — a serious public health concern. Rosemead's violation count is roughly in line with the national average for California. Contaminants associated with violations include Fecal Coliform, Stage 2 DBP, Total Haloacetic Acids (HAA5).
Contaminants Found
Indicates direct fecal contamination; associated with diarrhea, cramps, nausea, and potential severe illness.
Common source: Human and animal fecal waste
EPA limit: Zero tolerance (any positive triggers violations)
Trihalomethanes and haloacetic acids that increase cancer risk and may cause adverse reproductive outcomes.
Common source: Chlorine disinfection reacting with natural organic matter in source water
EPA limit: TTHM: 0.080 mg/L; HAA5: 0.060 mg/L
Haloacetic acids are associated with increased cancer risk and potential reproductive and developmental effects.
Common source: Reaction of chlorine disinfectants with organic matter in treated water
EPA limit: 0.060 mg/L (60 ppb)
Water Systems Serving Rosemead
| System Name | PWSID | Source | Population | Violations |
|---|---|---|---|---|
| CAL AMERICAN WATER CO | CA5610040 | Surface Water | 66,809 | 4 |
| CAL/AM WATER COMPANY - SAN MARINO | CA1910139 | Surface Water | 47,995 | 2 |
| SAN GABRIEL COUNTY WD | CA1910144 | Groundwater | 39,345 | 0 |
| CAL-AM WATER COMPANY - DUARTE | CA1910186 | Groundwater | 24,773 | 0 |
| CAL/AM WATER COMPANY - BALDWIN HILLS | CA1910052 | Surface Water | 20,724 | 0 |
| CAL-AM WATER COMPANY - EAST PASADENA | CA1910020 | Groundwater | 9,949 | 0 |
| BELLFLOWER MUNICIPAL WATER SYSTEM | CA1910018 | Surface Water | 5,999 | 0 |
| AMARILLO MUTUAL WATER COMPANY | CA1910002 | Groundwater | 3,134 | 19 |
| CAL AMERICAN WC - LAS POSAS ESTATES | CA5610081 | Surface Water | 2,039 | 0 |
| CAL AMERICAN WATER COMPANY - PIRU | CA5610021 | Groundwater | 2,003 | 2 |
| CAL AMERICAN WC - RIO PLAZA | CA5610010 | Groundwater | 1,709 | 1 |
| GOLDEN SANDS MOBILE HOME PARK | CA1900649 | Groundwater | 450 | 2 |
| SCE/BIG CREEK POWERHOUSE 1 | CA1009111 | Surface Water | 104 | 17 |
| SCE BISHOP CREEK PLANT 4 | CA1400078 | Groundwater | 38 | 1 |
Concerned About Your Water?
A home water filter can remove common contaminants. NSF-certified filters are tested against EPA standards.
Consider a reverse osmosis system for comprehensive filtration or a carbon filter for basic improvement.
Other Cities in California
Data Sources
Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). Data includes all recorded violations for active community water systems.