Contaminant 0400
Unresolved Disinfectants and Disinfection Byproducts (Stage 2) violation cited in 2021 (contaminant 0400).
PWSID SC0210001 · Surface waterMunicipal
45,090 people served. 7 health-based SDWIS violations recorded in the past 5 years. 7 remain unresolved. Last cited 5 years ago.
Unresolved Disinfectants and Disinfection Byproducts (Stage 2) violation cited in 2021 (contaminant 0400).
Unresolved Disinfectants and Disinfection Byproducts (Stage 2) violation cited in 2021 (contaminant 0400).
Unresolved Disinfectants and Disinfection Byproducts (Stage 2) violation cited in 2021 (contaminant 0400).
Unresolved Disinfectants and Disinfection Byproducts (Stage 2) violation cited in 2021 (contaminant 0400).
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
Treatment technique violation
Treatment technique violation
Treatment technique violation
Treatment technique violation
Treatment technique violation
Treatment technique violation
Aiken, South Carolina (Census place; block-group disparity scores aggregated by centroid containment): a service population of 32,014. Local disparity score for pm2.5 (fine particulate) sits moderately above the reference (123). Why we surface this →
Low-income
People of color
Under age 5
Over age 64
| Indicator | Disparity score | Reading |
|---|---|---|
| PM2.5 (fine particulate) | 123 | moderately above the reference |
| Ozone | 21 | well below the reference |
| Nitrogen dioxide (NO₂) | 69 | below the reference |
| Diesel particulate | 55 | below the reference |
| Toxic releases (RSEI) | 133 | moderately above the reference |
| Traffic proximity | 53 | below the reference |
| Lead-paint risk (pre-1960 housing) | 88 | below the reference |
| Superfund site proximity | 2 | well below the reference |
| RMP-facility proximity | 0 | well below the reference |
| Hazardous-waste site proximity | 57 | below the reference |
| Underground storage tanks | 114 | moderately above the reference |
| NPDES wastewater proximity | 0 | well below the reference |
| Drinking-water non-compliance | 0 | 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 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.