Contaminant 5200
Unresolved Phase I/II/V Inorganic Chemical Rules violation cited in 2024 (contaminant 5200).
PWSID CA5000005 · GroundwaterMunicipal
500 people served. 1 health-based SDWIS violation recorded in the past 5 years. 4 remain unresolved. Last cited 2 years ago.
Unresolved Phase I/II/V Inorganic Chemical Rules violation cited in 2024 (contaminant 5200).
Unresolved Phase I/II/V Inorganic Chemical Rules violation cited in 2024 (contaminant 5200).
Unresolved Phase I/II/V Inorganic Chemical Rules violation cited in 2023 (beryllium).
Unresolved Phase I/II/V Inorganic Chemical Rules violation cited in 2023 (beryllium).
Health-based violations exceed an MCL or treatment-technique standard. Monitoring violations are reporting failures with no measured exceedance — they tell you the system isn't fully transparent, not that the water is unsafe today.
Treatment technique violation
Reporting failure
Failure to monitor as scheduled
Failure to monitor as scheduled
Stanislaus County, California (utility's served county per SDWIS GEOGRAPHIC_AREA — city-level not yet matched): a service population of 552,063. Local disparity score for pm2.5 (fine particulate) sits well above the reference burden (173). Why we surface this →
Low-income
People of color
Under age 5
Over age 64
| Indicator | Disparity score | Reading |
|---|---|---|
| PM2.5 (fine particulate) | 173 | well above the reference burden |
| Ozone | 163 | well above the reference burden |
| Nitrogen dioxide (NO₂) | 82 | below the reference |
| Diesel particulate | 138 | moderately above the reference |
| Toxic releases (RSEI) | 59 | below the reference |
| Traffic proximity | 105 | near the reference |
| Lead-paint risk (pre-1960 housing) | 70 | below the reference |
| Superfund site proximity | 115 | moderately above the reference |
| RMP-facility proximity | 134 | moderately above the reference |
| Hazardous-waste site proximity | 127 | moderately above the reference |
| Underground storage tanks | 0 | well below the reference |
| NPDES wastewater proximity | 41 | well below the reference |
| Drinking-water non-compliance | 12 | well below the reference |
Source: Census ACS 2018-2022 (5-year) + USEPA-clone EJ blockgroup stats (raw indicators + EJ disparity mirror).
Source. EPA Safe Drinking Water Information System · retrieved 2026-05-07. Reporting period 2023-01-01 → 2026-05-07.
What this is not. SDWIS records compliance against federal MCLs — not a direct readout of tap-water concentrations. Active health-based violations are not the same as a current crisis; we link to the EPA record so you can verify return-to-compliance status before forming a conclusion.