Drinking water quality
What is in your water, by the utility that delivers it
EPA Six-Year Review sample-level drinking water data + Consumer Confidence Report aggregation per community water system. Free, public, indexable. Built so a citizen, a city auditor, or a chemical procurement officer can answer the same question: which regulated contaminants does this system see, at what concentration, and how often.
For whom
- Citizens asking what is in their tap water
- City auditors + water-utility managers
- Chemical suppliers tracking near-MCL contaminants
- Infrastructure investors evaluating treatment-pressure sites
- Grant writers citing per-system compliance trends
What you find
- Per-utility regulated contaminant readings
- MCL exceedance counts + near-MCL flags
- State-cohort top-contaminant rankings
- Source-water context (linked to existing climate + wastewater bands)
- Citable EPA source URLs for every value
Where the data comes from
- EPA Six-Year Review (SYR4)
- EPA's national sample-level SDWA compliance dataset. Most recent release covers 2012-2019. Source for the per-utility contaminant ratios + state-cohort exceedance rankings. Next refresh: SYR5, expected 2029.
- Consumer Confidence Reports (CCRs)
- Annual mandatory publications each community water system produces. Source for the most-recent contaminant detection levels per utility. Coverage expands state-by-state as ingest lanes land.
- SDWIS violations
- EPA Safe Drinking Water Information System enforcement records. Already loaded on every per-utility profile.