Rosemead Water Quality
California
According to EPA SDWIS, Rosemead, California is served by 15 community water systems covering about 225,761 people. The same extract lists 5 health-based violation records, most recently coded 5200 in 2024. Counts are historical EPA registry rows, not a current compliance or drinkability score.
Drinking water in Rosemead, California is delivered through 15 EPA-regulated community water systems serving an estimated 225,761 people. Each system is tracked in the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act, which requires testing for regulated contaminants, consumer notification of violations, and publication of an annual Consumer Confidence Report.
PlainEnviro's health-based SDWIS extract shows 5 violation records across the 15 active community systems shown here. Monitoring and reporting records are not present in the extract. The records carry 3 distinct EPA contaminant codes: LEAD AND COPPER RULE REVISIONS, Surface Water Treatment Rule, Total Haloacetic Acids (HAA5). 2 TRI-reporting industrial facilities are also located within the city limits.
A past EPA health-based registry row does not describe water delivered today or current compliance status; utilities notify customers and remediate under state primacy oversight when required. For current water-quality status and treatment practices, review your local utility's most recent Consumer Confidence Report or contact the California drinking water program. All records above reflect federal EPA SDWIS data and are not independently verified against state databases.
Community Water Systems
| System Name | Pop. Served | Violations | Status |
|---|---|---|---|
| CAL AMERICAN WATER CO | 66,809 | 0 | Clean |
| CAL/AM WATER COMPANY - SAN MARINO | 47,995 | 0 | Clean |
| SAN GABRIEL COUNTY WD | 39,345 | 0 | Clean |
| CAL-AM WATER COMPANY - DUARTE | 24,773 | 0 | Clean |
| CAL/AM WATER COMPANY - BALDWIN HILLS | 20,724 | 0 | Clean |
| CAL-AM WATER COMPANY - EAST PASADENA | 9,949 | 0 | Clean |
| BELLFLOWER MUNICIPAL WATER SYSTEM | 5,999 | 0 | Clean |
| AMARILLO MUTUAL WATER COMPANY | 3,134 | 0 | Clean |
| CAL AMERICAN WC - LAS POSAS ESTATES | 2,039 | 0 | Clean |
| CAL AMERICAN WATER COMPANY - PIRU | 2,003 | 0 | Clean |
| CAL AMERICAN WC - RIO PLAZA | 1,709 | 0 | Clean |
| CAL AMERICAN - YERBA BUENA | 690 | 0 | Clean |
| GOLDEN SANDS MOBILE HOME PARK | 450 | 1 | Health |
| SCE/BIG CREEK POWERHOUSE 1 | 104 | 4 | Health |
| SCE BISHOP CREEK PLANT 4 | 38 | 0 | Clean |
Does this city have health-based water violations?
These health-based records can represent Maximum Contaminant Level (MCL), Treatment Technique (TT), or Maximum Residual Disinfectant Level (MRDL) categories. A historical record does not establish that water is currently unsafe.
| Water system | Contaminant | Begin Date |
|---|---|---|
| GOLDEN SANDS MOBILE HOME PARK | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| SCE/BIG CREEK POWERHOUSE 1 | Surface Water Treatment Rule | 2018-04-01 |
| SCE/BIG CREEK POWERHOUSE 1 | Surface Water Treatment Rule | 2018-04-01 |
| SCE/BIG CREEK POWERHOUSE 1 | Total Haloacetic Acids (HAA5) | 2015-07-01 |
| SCE/BIG CREEK POWERHOUSE 1 | Total Haloacetic Acids (HAA5) | 2015-07-01 |
What are Rosemead's health-based records for?
Rosemead's health-based violation records carry 3 distinct EPA codes: some name a substance, others the drinking-water rule that was breached. Counts are records on file in the EPA SDWIS extract, not current test results.
| Contaminant | Records | Systems |
|---|---|---|
| Surface Water Treatment Rule | 2 | 1 |
| Total Haloacetic Acids (HAA5) | 2 | 1 |
| Lead and Copper Rule Revisions | 1 | 1 |
TRI Facilities in Rosemead
| Facility | Total Releases |
|---|---|
| M. Argueso & Co. Inc. | 1.2M lbs |
| Hermetic Seal Corp | 0 lbs |
Frequently Asked Questions
What does EPA SDWIS list for drinking water in Rosemead, California? ▼
How many water violations does Rosemead have in this EPA extract? ▼
What contaminants were found in Rosemead water? ▼
How many water systems serve Rosemead? ▼
Where does Rosemead get its drinking water? ▼
Are there pollution sources near Rosemead? ▼
How does Rosemead compare in California?
Of the 909 California places with at least one community water system on file, Rosemead ranks #25 by number of systems (15).
Either side of it: Modesto (16), Napa (16), San Diego (15), Watsonville (15)
About This Data
Figures here are the current EPA SDWIS extract joined to the 15 community water systems whose service area lists Rosemead, ranked against the 909 California places with at least one system on file. Data current as of 2026-08-25.
Water system data comes from the EPA's Safe Drinking Water Information System (SDWIS). PlainEnviro's violation fetch is restricted upstream to records EPA flags as health-based and then joined to active community water systems. Monitoring and reporting violations are not included.
A health-based violation row in this extract is a historical EPA registry entry. It does not describe water delivered today or current compliance status. Many records are later resolved, and public water systems notify customers when required. For current conditions, contact your local water utility or the state drinking water program.
TRI facility data comes from the EPA Toxic Release Inventory. Facilities shown are those that self-report to the TRI program. PlainEnviro presents this data without advocacy framing.
Read our methodology - how this data is sourced, computed, and verified.