Royal Oaks Water Quality
California
According to EPA SDWIS, Royal Oaks, California is served by 17 community water systems covering about 10,271 people. The same extract lists 121 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 Royal Oaks, California is delivered through 17 EPA-regulated community water systems serving an estimated 10,271 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 121 violation records across the 17 active community systems shown here. Monitoring and reporting records are not present in the extract. The records carry 4 distinct EPA contaminant codes: Revised Total Coliform Rule, Arsenic, Nitrate, 1,2,3-Trichloropropane.
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 |
|---|---|---|---|
| PSMCSD - PAJARO | 6,500 | 0 | Clean |
| PSMCSD - NORMCO | 928 | 0 | Clean |
| PSMCSD - SUNNY MESA | 880 | 0 | Clean |
| PSMCSD - MOSS LANDING HARBOR WS | 520 | 0 | Clean |
| PSMCSD - VEGA RD WS #01 | 438 | 0 | Clean |
| PSMCSD - SPRINGFIELD WS | 200 | 56 | Health |
| PSMCSD - VIERRA ESTATES WS | 164 | 6 | Health |
| SAN MIGUEL WS #01 | 100 | 59 | Health |
| PSMCSD - LANGLEY/VALLE PACIFICO WS | 81 | 0 | Clean |
| MANZANITA HILLS WA | 75 | 0 | Clean |
| PSMCSD - BLACKIE RD WS | 60 | 0 | Clean |
| DELANY WC | 60 | 0 | Clean |
| ROYAL OAK PLACE WS | 60 | 0 | Clean |
| CHETMOORE ACRES WA | 59 | 0 | Clean |
| APRICOT LN WS | 53 | 0 | Clean |
| MAHER RD WS #05 | 48 | 0 | Clean |
| SAN MIGUEL WS #03 | 45 | 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 |
|---|---|---|
| SAN MIGUEL WS #01 | Revised Total Coliform Rule | 2025-11-18 |
| PSMCSD - VIERRA ESTATES WS | Arsenic | 2024-10-01 |
| PSMCSD - VIERRA ESTATES WS | Arsenic | 2024-10-01 |
| PSMCSD - SPRINGFIELD WS | Nitrate | 2024-10-01 |
| PSMCSD - SPRINGFIELD WS | Nitrate | 2024-10-01 |
| PSMCSD - VIERRA ESTATES WS | Arsenic | 2024-07-01 |
| PSMCSD - VIERRA ESTATES WS | Arsenic | 2024-07-01 |
| PSMCSD - SPRINGFIELD WS | Nitrate | 2024-07-01 |
| PSMCSD - SPRINGFIELD WS | Nitrate | 2024-07-01 |
| PSMCSD - SPRINGFIELD WS | Nitrate | 2024-07-01 |
| PSMCSD - VIERRA ESTATES WS | Arsenic | 2024-04-01 |
| PSMCSD - VIERRA ESTATES WS | Arsenic | 2024-04-01 |
| PSMCSD - SPRINGFIELD WS | Nitrate | 2024-04-01 |
| PSMCSD - SPRINGFIELD WS | Nitrate | 2024-04-01 |
| PSMCSD - SPRINGFIELD WS | Nitrate | 2024-01-01 |
| PSMCSD - SPRINGFIELD WS | Nitrate | 2024-01-01 |
| PSMCSD - SPRINGFIELD WS | Nitrate | 2023-10-01 |
| PSMCSD - SPRINGFIELD WS | Nitrate | 2023-10-01 |
| PSMCSD - SPRINGFIELD WS | Nitrate | 2023-07-01 |
| PSMCSD - SPRINGFIELD WS | Nitrate | 2023-07-01 |
| PSMCSD - SPRINGFIELD WS | Nitrate | 2023-04-01 |
| PSMCSD - SPRINGFIELD WS | Nitrate | 2023-04-01 |
| PSMCSD - SPRINGFIELD WS | Nitrate | 2023-01-01 |
| PSMCSD - SPRINGFIELD WS | Nitrate | 2023-01-01 |
| PSMCSD - SPRINGFIELD WS | Nitrate | 2022-10-01 |
| PSMCSD - SPRINGFIELD WS | Nitrate | 2022-10-01 |
| PSMCSD - SPRINGFIELD WS | Nitrate | 2022-07-01 |
| PSMCSD - SPRINGFIELD WS | Nitrate | 2022-07-01 |
| PSMCSD - SPRINGFIELD WS | Nitrate | 2022-04-01 |
| PSMCSD - SPRINGFIELD WS | Nitrate | 2022-04-01 |
| PSMCSD - SPRINGFIELD WS | Nitrate | 2022-01-01 |
| PSMCSD - SPRINGFIELD WS | Nitrate | 2021-10-01 |
| PSMCSD - SPRINGFIELD WS | Nitrate | 2021-07-01 |
| PSMCSD - SPRINGFIELD WS | Nitrate | 2021-04-01 |
| PSMCSD - SPRINGFIELD WS | Nitrate | 2021-01-01 |
| PSMCSD - SPRINGFIELD WS | Nitrate | 2020-10-01 |
| PSMCSD - SPRINGFIELD WS | Nitrate | 2020-07-01 |
| PSMCSD - SPRINGFIELD WS | Nitrate | 2020-04-01 |
| PSMCSD - SPRINGFIELD WS | Nitrate | 2020-01-01 |
| SAN MIGUEL WS #01 | Nitrate | 2020-01-01 |
| PSMCSD - SPRINGFIELD WS | 1,2,3-Trichloropropane | 2019-10-01 |
| PSMCSD - SPRINGFIELD WS | Nitrate | 2019-10-01 |
| SAN MIGUEL WS #01 | Nitrate | 2019-10-01 |
| PSMCSD - SPRINGFIELD WS | 1,2,3-Trichloropropane | 2019-07-01 |
| PSMCSD - SPRINGFIELD WS | Nitrate | 2019-07-01 |
| SAN MIGUEL WS #01 | Nitrate | 2019-07-01 |
| PSMCSD - SPRINGFIELD WS | 1,2,3-Trichloropropane | 2019-04-01 |
| PSMCSD - SPRINGFIELD WS | Nitrate | 2019-04-01 |
| SAN MIGUEL WS #01 | Nitrate | 2019-04-01 |
| PSMCSD - SPRINGFIELD WS | 1,2,3-Trichloropropane | 2019-01-01 |
What are Royal Oaks's health-based records for?
Royal Oaks's health-based violation records carry 4 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 |
|---|---|---|
| Nitrate | 106 | 2 |
| 1,2,3-Trichloropropane | 8 | 1 |
| Arsenic | 6 | 1 |
| Revised Total Coliform Rule | 1 | 1 |
Frequently Asked Questions
What does EPA SDWIS list for drinking water in Royal Oaks, California? ▼
How many water violations does Royal Oaks have in this EPA extract? ▼
What contaminants were found in Royal Oaks water? ▼
How many water systems serve Royal Oaks? ▼
Where does Royal Oaks get its drinking water? ▼
How does Royal Oaks compare in California?
Of the 909 California places with at least one community water system on file, Royal Oaks ranks #19 by number of systems (17).
Either side of it: Redding (18), Oakdale (17), Santa Barbara (17), Thermal (17)
About This Data
Figures here are the current EPA SDWIS extract joined to the 17 community water systems whose service area lists Royal Oaks, 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.