Contaminant 5200
Unresolved Phase I/II/V Inorganic Chemical Rules violation cited in 2025 (contaminant 5200).
PWSID LA1099008 · GroundwaterMunicipal
12,801 people served. 7 health-based SDWIS violations recorded in the past 5 years. 5 remain unresolved. Last cited 1 year ago.
Unresolved Phase I/II/V Inorganic Chemical Rules violation cited in 2025 (contaminant 5200).
Unresolved Phase I/II/V Inorganic Chemical Rules violation cited in 2025 (contaminant 5000).
Unresolved Drinking water rule (140) violation cited in 2022 (contaminant 0700).
Unresolved Drinking water rule (140) violation cited in 2022 (contaminant 0700).
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.
Reporting failure
Failure to monitor as scheduled
Treatment technique violation
Treatment technique violation; returned to compliance
Treatment technique violation; returned to compliance
Treatment technique violation
Treatment technique violation; returned to compliance
Treatment technique violation; returned to compliance
Treatment technique violation
Reporting failure; returned to compliance
Reporting failure; returned to compliance
OTHER; returned to compliance
OTHER; returned to compliance
OTHER; returned to compliance
OTHER; returned to compliance
OTHER; returned to compliance
OTHER; returned to compliance
St. Martin Parish, Louisiana (utility's served county per SDWIS GEOGRAPHIC_AREA — city-level not yet matched): a service population of 51,856. Local disparity score for pm2.5 (fine particulate) sits below the reference (67). Why we surface this →
Low-income
People of color
Under age 5
Over age 64
| Indicator | Disparity score | Reading |
|---|---|---|
| PM2.5 (fine particulate) | 67 | below the reference |
| Ozone | 23 | well below the reference |
| Nitrogen dioxide (NO₂) | 36 | well below the reference |
| Diesel particulate | 28 | well below the reference |
| Toxic releases (RSEI) | 73 | below the reference |
| Traffic proximity | 20 | well below the reference |
| Lead-paint risk (pre-1960 housing) | 52 | below the reference |
| Superfund site proximity | 0 | well below the reference |
| RMP-facility proximity | 108 | near the reference |
| Hazardous-waste site proximity | 25 | well below the reference |
| Underground storage tanks | 58 | below the reference |
| NPDES wastewater proximity | 100 | near the reference |
| Drinking-water non-compliance | 129 | moderately above 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 2022-01-01 → 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.