Riverside Water Quality
California
According to EPA SDWIS, Riverside, California is served by 7 community water systems covering about 402,209 people. The same extract lists 17 health-based violation records, most recently coded 8000 in 2025. Counts are historical EPA registry rows, not a current compliance or drinkability score.
Drinking water in Riverside, California is delivered through 7 EPA-regulated community water systems serving an estimated 402,209 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 17 violation records across the 7 active community systems shown here. Monitoring and reporting records are not present in the extract. The records carry 3 distinct EPA contaminant codes: Revised Total Coliform Rule, Arsenic, Gross Alpha, Excl. Radon and U. 17 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 |
|---|---|---|---|
| RIVERSIDE, CITY OF | 298,398 | 0 | Clean |
| WESTERN MWD | 86,062 | 0 | Clean |
| WESTERN MWD - MURRIETA DIVISION | 17,453 | 0 | Clean |
| WESTERN MWD (ID A - RAINBOW) | 192 | 0 | Clean |
| HARMONY HAVEN | 54 | 0 | Clean |
| 37 MOBILE HOMES | 50 | 17 | Health |
| WESTERN MWD (ARLINGTON) | 0 | 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 |
|---|---|---|
| 37 MOBILE HOMES | Revised Total Coliform Rule | 2025-04-01 |
| 37 MOBILE HOMES | Revised Total Coliform Rule | 2025-04-01 |
| 37 MOBILE HOMES | Arsenic | 2025-04-01 |
| 37 MOBILE HOMES | Arsenic | 2025-04-01 |
| 37 MOBILE HOMES | Arsenic | 2025-01-01 |
| 37 MOBILE HOMES | Arsenic | 2025-01-01 |
| 37 MOBILE HOMES | Arsenic | 2025-01-01 |
| 37 MOBILE HOMES | Arsenic | 2024-10-01 |
| 37 MOBILE HOMES | Arsenic | 2024-10-01 |
| 37 MOBILE HOMES | Arsenic | 2024-10-01 |
| 37 MOBILE HOMES | Arsenic | 2024-10-01 |
| 37 MOBILE HOMES | Arsenic | 2023-07-01 |
| 37 MOBILE HOMES | Arsenic | 2023-07-01 |
| 37 MOBILE HOMES | Arsenic | 2023-07-01 |
| 37 MOBILE HOMES | Gross Alpha, Excl. Radon and U | 2016-04-01 |
| 37 MOBILE HOMES | Gross Alpha, Excl. Radon and U | 2016-04-01 |
| 37 MOBILE HOMES | Gross Alpha, Excl. Radon and U | 2016-01-01 |
What are Riverside's health-based records for?
Riverside'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 |
|---|---|---|
| Arsenic | 12 | 1 |
| Gross Alpha, Excl. Radon and U | 3 | 1 |
| Revised Total Coliform Rule | 2 | 1 |
TRI Facilities in Riverside
| Facility | Total Releases |
|---|---|
| Newbasis LLC | 77.7K lbs |
| Stremicks Heritage Foods | 22.9K lbs |
| Qg Printing II LLC | 16.7K lbs |
| Dura Coat Products Inc (axalta Coating Systems) | 6.6K lbs |
| Qg Printing II LLC | 5.2K lbs |
| Airgas Specialty Products-Riverside Ca | 4.7K lbs |
| Ralphs Grocery Co-Riverside Distribution | 3.9K lbs |
| Carpenter Co | 2.6K lbs |
| Pepsi Bottling Group LLC | 2.1K lbs |
| Plz Corp. | 550 lbs |
Frequently Asked Questions
What does EPA SDWIS list for drinking water in Riverside, California? ▼
How many water violations does Riverside have in this EPA extract? ▼
What contaminants were found in Riverside water? ▼
How many water systems serve Riverside? ▼
Where does Riverside get its drinking water? ▼
Are there pollution sources near Riverside? ▼
How does Riverside compare in California?
Of the 909 California places with at least one community water system on file, Riverside ranks #91 by number of systems (7).
Either side of it: Oroville (7), Rancho Cucamonga (7), Santa Cruz (7), Santa Maria (7)
About This Data
Figures here are the current EPA SDWIS extract joined to the 7 community water systems whose service area lists Riverside, 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.