Side-by-side water intelligence
Compare water intelligence.
Put cities, states, water systems, or ZIP codes next to each other and read the measurable differences. PurityMap never combines them into a single winner or safety verdict.
CompareUp to 3, side by side. No overall score, rank or verdict. Missing evidence stays missing.
Water systemHARRIS COUNTY WCID 21TX1010769 · TX
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Identity
Side by side
BasisEach column shows its latest public record. Sample years can differ between columns, so compare with care.
| Field | HARRIS COUNTY WCID 21 |
|---|---|
| System | HARRIS COUNTY WCID 21 |
| Place | Harris County Wcid |
| Population served | 13,845 |
| Source type | Surface Water |
| Record updated | 2026-09-16 |
| Findings on record | 31 |
| Above a listed reference | 1 |
Substance by substance
Where the records differ
Detected results first. Each cell keeps the published result and its record state. “No record” is different from “not detected”.
- Above a reference
- Detected, within reference
- Not detected
- No record
| Substance · reference | HARRIS COUNTY WCID 21 |
|---|---|
| Lithium10.0 µg/L EPA health reference level (screening, not a legal limit) | 19.5µg/LAbove a reference |
| Perfluorobutanoic acid (PFBA)No federal or state limit; shown for transparency | 8.2ng/LDetected, no limit |
| Perfluorohexanoic acid (PFHxA)400000.0 ng/L Michigan EGLE state MCL (strictest US state) | 3.6ng/LDetected, within reference |
| Lead (90th percentile)15 µg/L federal action level | 2.95µg/LDetected, within reference |
Comparison boundary
Continue with one system.
Different monitoring periods, source types and coverage can limit direct comparison. Missing evidence stays missing; it is never scored as favourable, and nothing here is combined into an overall rank or safety verdict.