Contaminant 5200
Unresolved Phase I/II/V Inorganic Chemical Rules violation cited in 2024 (contaminant 5200).
California · drinking water · SDWIS through latest publish
Calexico, City Of Water Quality — Calexico, California
PWSID CA1310002 · Purchased / wholesaleMunicipal
40,357 people served. 1 health-based SDWIS violation recorded in the past 5 years. 2 remain unresolved. Last cited 2 years ago.
Anomaly engine
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Contaminant 5200
Unresolved Phase I/II/V Inorganic Chemical Rules violation cited in 2024 (contaminant 5200).
Most-cited contaminants
What This Utility Gets Cited For
- Contaminant 52002 citations
Violation history
What's On The SDWIS Record
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.
HEALTH-BASED · CONTAMINANT 5200
2024 · Contaminant 5200 · Phase I/II/V Inorganic Chemical Rules
Treatment technique violation
MONITORING · CONTAMINANT 5200
2024 · Contaminant 5200 · Phase I/II/V Inorganic Chemical Rules
Reporting failure
Equity context · ACS 2018-2022 · USEPA-clone EJ disparity
Who Drinks This Water
Calexico, California (Census place; block-group disparity scores aggregated by centroid containment): a service population of 38,599. Local disparity score for pm2.5 (fine particulate) sits severely above the reference burden (250). Why we surface this →
22.6%
Low-income
99.2%
People of color
7.4%
Under age 5
15.6%
Over age 64
- PM2.5 (fine particulate)Health riskFine inhalable particles 2.5 micrometers or smaller. They travel deep into the lungs and into the bloodstream — linked to asthma, heart disease, stroke, and premature death.89in the highest 20% nationally
- OzoneHealth riskGround-level ozone (smog) inflames the airways. Even short exposures trigger asthma attacks and worsen chronic lung and heart disease.81in the highest 20% nationally
- Nitrogen dioxide (NO₂)Health riskA tailpipe and combustion gas. Concentrates near busy roads and industrial sites; raises risk of airway inflammation, asthma, and lower respiratory infections in children.86in the highest 20% nationally
- Diesel particulateHealth riskSoot from diesel engines (trucks, trains, ports, construction). EPA classifies it as a likely human carcinogen and a major driver of childhood asthma near freight corridors.59near the national median
- Toxic releases (RSEI)Health riskEPA's Risk-Screening Environmental Indicators score — weights TRI chemical releases by toxicity, where they go, and how many people are nearby. Higher means greater modeled cancer and chronic-health risk.2below the national median
- Traffic proximityHealth riskPopulation-weighted distance to high-volume roads. Living close to heavy traffic raises exposure to PM2.5, NO₂, and diesel exhaust — and the cardiovascular and asthma risks that follow.53near the national median
- Lead-paint risk (pre-1960 housing)Health riskShare of housing built before 1960, when lead-based paint was common. Dust from deteriorating paint is the leading cause of childhood lead poisoning, which permanently impairs cognitive development.47near the national median
- Superfund site proximityHealth riskPopulation-weighted distance to NPL Superfund sites — the most contaminated waste sites in the country. Nearby groundwater, soil, and air can carry industrial solvents, metals, and other long-lived contaminants.56near the national median
- RMP-facility proximityHealth riskDistance to facilities holding chemicals at quantities large enough to require an EPA Risk Management Plan (refineries, fertilizer plants, etc.). These pose acute exposure risk during accidental releases.83in the highest 20% nationally
- Hazardous-waste site proximityHealth riskDistance to RCRA hazardous-waste handlers (treatment, storage, disposal facilities). Indicates potential exposure to industrial chemicals in air, soil, and groundwater.59near the national median
- Underground storage tanksHealth riskDensity of underground tanks (gasoline, heating oil, industrial fluids). Leaking tanks are a leading source of benzene and other volatile organic compounds in groundwater drinking-water supplies.28below the national median
- NPDES wastewater proximityHealth riskDistance to permitted industrial wastewater dischargers. Closer proximity raises exposure to pollutants released into surface waters used for fishing, recreation, and downstream drinking-water intakes.41near the national median
- Drinking-water non-complianceHealth riskEPA score for public water systems with health-based Safe Drinking Water Act violations. Higher means more residents on systems that recently exceeded safe limits for contaminants like lead, arsenic, or nitrate.76above the national median
| Indicator | Disparity score | Reading |
|---|---|---|
| PM2.5 (fine particulate) | 250 | severely above the reference burden |
| Ozone | 249 | severely above the reference burden |
| Nitrogen dioxide (NO₂) | 235 | severely above the reference burden |
| Diesel particulate | 157 | well above the reference burden |
| Toxic releases (RSEI) | 6 | well below the reference |
| Traffic proximity | 144 | moderately above the reference |
| Lead-paint risk (pre-1960 housing) | 98 | near the reference |
| Superfund site proximity | 0 | well below the reference |
| RMP-facility proximity | 225 | severely above the reference burden |
| Hazardous-waste site proximity | 156 | well above the reference burden |
| Underground storage tanks | 0 | well below the reference |
| NPDES wastewater proximity | 110 | moderately above 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 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.