Chlorine
Unresolved Disinfectants and Disinfection Byproducts (Stage 2) violation cited in 2024 (chlorine).
PWSID NM3554207 · GroundwaterMunicipal
831 people served. 3 health-based SDWIS violations recorded in the past 5 years. 2 remain unresolved. Last cited 2 years ago.
Unresolved Disinfectants and Disinfection Byproducts (Stage 2) violation cited in 2024 (chlorine).
Unresolved Disinfectants and Disinfection Byproducts (Stage 2) violation cited in 2023 (chlorine).
Drinking water rule (140) health-based violation cited in 2024 (contaminant 0700).
Drinking water rule (140) health-based violation cited in 2024 (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.
Failure to monitor as scheduled; returned to compliance
Failure to monitor as scheduled; returned to compliance
Failure to monitor as scheduled
Failure to monitor as scheduled; returned to compliance
Treatment technique violation; returned to compliance
Treatment technique violation; returned to compliance
Treatment technique violation; returned to compliance
Failure to monitor as scheduled; returned to compliance
Failure to monitor as scheduled; returned to compliance
Failure to monitor as scheduled
Failure to monitor as scheduled; returned to compliance
Failure to monitor as scheduled; returned to compliance
Failure to monitor as scheduled; returned to compliance
Failure to monitor as scheduled; returned to compliance
Las Cruces, New Mexico (Census place; block-group disparity scores aggregated by centroid containment): a service population of 111,273. Local disparity score for pm2.5 (fine particulate) sits well below the reference (17). Why we surface this →
Low-income
People of color
Under age 5
Over age 64
| Indicator | Disparity score | Reading |
|---|---|---|
| PM2.5 (fine particulate) | 17 | well below the reference |
| Ozone | 199 | well above the reference burden |
| Nitrogen dioxide (NO₂) | 185 | well above the reference burden |
| Diesel particulate | 160 | well above the reference burden |
| Toxic releases (RSEI) | 6 | well below the reference |
| Traffic proximity | 102 | near the reference |
| Lead-paint risk (pre-1960 housing) | 69 | below the reference |
| Superfund site proximity | 180 | well above the reference burden |
| RMP-facility proximity | 0 | well below the reference |
| Hazardous-waste site proximity | 102 | near the reference |
| Underground storage tanks | 115 | moderately above the reference |
| NPDES wastewater proximity | 19 | well below the reference |
| Drinking-water non-compliance | 209 | severely above the reference burden |
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 2021-01-01 → 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.