Contaminant 2051
Unresolved Nitrate/Nitrite violation cited in 2025 (contaminant 2051).
PWSID MA3128000 · Surface waterMunicipal
63,235 people served. No health-based SDWIS violations recorded in the past 5 years. 39 remain unresolved. Last cited 1 year ago.
Unresolved Nitrate/Nitrite violation cited in 2025 (contaminant 2051).
Unresolved Nitrate/Nitrite violation cited in 2025 (2,4-d).
Unresolved Nitrate/Nitrite violation cited in 2025 (contaminant 2046).
Unresolved Nitrate/Nitrite violation cited in 2025 (contaminant 2959).
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.
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Haverhill, Massachusetts (Census place; block-group disparity scores aggregated by centroid containment): a service population of 67,273. Local disparity score for pm2.5 (fine particulate) sits well below the reference (6). Why we surface this →
Low-income
People of color
Under age 5
Over age 64
| Indicator | Disparity score | Reading |
|---|---|---|
| PM2.5 (fine particulate) | 6 | well below the reference |
| Ozone | 29 | well below the reference |
| Nitrogen dioxide (NO₂) | 97 | near the reference |
| Diesel particulate | 51 | below the reference |
| Toxic releases (RSEI) | 39 | well below the reference |
| Traffic proximity | 105 | near the reference |
| Lead-paint risk (pre-1960 housing) | 85 | below the reference |
| Superfund site proximity | 99 | near the reference |
| RMP-facility proximity | 99 | near the reference |
| Hazardous-waste site proximity | 96 | near the reference |
| Underground storage tanks | 77 | below the reference |
| NPDES wastewater proximity | 63 | below the reference |
| Drinking-water non-compliance | 90 | near 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.