Arsenic
Unresolved Phase I/II/V Inorganic Chemical Rules violation cited in 2025 (arsenic).
PWSID TX2400025 · GroundwaterMunicipal
460 people served. 23 health-based SDWIS violations recorded in the past 5 years. 26 remain unresolved. Last cited 1 year ago.
Unresolved Phase I/II/V Inorganic Chemical Rules violation cited in 2025 (arsenic).
Unresolved Phase I/II/V Inorganic Chemical Rules violation cited in 2025 (arsenic).
Unresolved Volatile Organic Chemical Rule violation cited in 2025 (contaminant 7500).
Unresolved Phase I/II/V Inorganic Chemical Rules violation cited in 2025 (arsenic).
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.
Maximum contaminant level exceeded
Maximum contaminant level exceeded
OTHER
Maximum contaminant level exceeded
Maximum contaminant level exceeded
Maximum contaminant level exceeded
Maximum contaminant level exceeded
OTHER
Maximum contaminant level exceeded
Maximum contaminant level exceeded
Maximum contaminant level exceeded
Maximum contaminant level exceeded
Maximum contaminant level exceeded
OTHER; returned to compliance
OTHER; returned to compliance
Maximum contaminant level exceeded
Maximum contaminant level exceeded
Maximum contaminant level exceeded
Maximum contaminant level exceeded
Maximum contaminant level exceeded
OTHER; returned to compliance
OTHER; returned to compliance
Maximum contaminant level exceeded
Maximum contaminant level exceeded
Maximum contaminant level exceeded
Maximum contaminant level exceeded
Maximum contaminant level exceeded
Maximum contaminant level exceeded
Treatment technique violation
Reporting failure
OTHER; returned to compliance
OTHER; returned to compliance
Monitoring failure; returned to compliance
OTHER; returned to compliance
OTHER; returned to compliance
Webb County, Texas (utility's served county per SDWIS GEOGRAPHIC_AREA — city-level not yet matched): a service population of 267,282. Local disparity score for pm2.5 (fine particulate) sits severely above the reference burden (206). Why we surface this →
Low-income
People of color
Under age 5
Over age 64
| Indicator | Disparity score | Reading |
|---|---|---|
| PM2.5 (fine particulate) | 206 | severely above the reference burden |
| Ozone | 61 | below the reference |
| Nitrogen dioxide (NO₂) | 184 | well above the reference burden |
| Diesel particulate | 87 | below the reference |
| Toxic releases (RSEI) | 245 | severely above the reference burden |
| Traffic proximity | 121 | moderately above the reference |
| Lead-paint risk (pre-1960 housing) | 57 | below the reference |
| Superfund site proximity | 0 | well below the reference |
| RMP-facility proximity | 208 | severely above the reference burden |
| Hazardous-waste site proximity | 82 | below the reference |
| Underground storage tanks | 132 | moderately above the reference |
| NPDES wastewater proximity | 156 | well above the reference burden |
| Drinking-water non-compliance | 11 | 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 2020-01-01 → 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.