Contaminant 4030
Unresolved Phase I/II/V Inorganic Chemical Rules violation cited in 2024 (contaminant 4030).
PWSID WI1130219 · GroundwaterMunicipal
4,100 people served. No health-based SDWIS violations recorded in the past 5 years. 10 remain unresolved. Last cited 2 years ago.
Unresolved Phase I/II/V Inorganic Chemical Rules violation cited in 2024 (contaminant 4030).
Unresolved Phase I/II/V Inorganic Chemical Rules violation cited in 2024 (contaminant 4010).
Unresolved Phase I/II/V Inorganic Chemical Rules violation cited in 2024 (uranium).
Unresolved Phase I/II/V Inorganic Chemical Rules violation cited in 2024 (combined radium 226/228).
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
Failure to monitor as scheduled
Failure to monitor as scheduled
Failure to monitor as scheduled
Failure to monitor as scheduled
OTHER; returned to compliance
OTHER; returned to compliance
OTHER; returned to compliance
OTHER; returned to compliance
Failure to monitor as scheduled
Failure to monitor as scheduled
Failure to monitor as scheduled
Failure to monitor as scheduled
Failure to monitor as scheduled
Dane County, Wisconsin (utility's served county per SDWIS GEOGRAPHIC_AREA — city-level not yet matched): a service population of 559,891. Local disparity score for pm2.5 (fine particulate) sits below the reference (57). Why we surface this →
Low-income
People of color
Under age 5
Over age 64
| Indicator | Disparity score | Reading |
|---|---|---|
| PM2.5 (fine particulate) | 57 | below the reference |
| Ozone | 49 | well below the reference |
| Nitrogen dioxide (NO₂) | 67 | below the reference |
| Diesel particulate | 39 | well below the reference |
| Toxic releases (RSEI) | 30 | well below the reference |
| Traffic proximity | 72 | below the reference |
| Lead-paint risk (pre-1960 housing) | 37 | well below the reference |
| Superfund site proximity | 48 | well below the reference |
| RMP-facility proximity | 50 | below the reference |
| Hazardous-waste site proximity | 51 | below the reference |
| Underground storage tanks | 47 | well below the reference |
| NPDES wastewater proximity | 45 | well below the reference |
| Drinking-water non-compliance | 5 | 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 2024-01-01 → 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.