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 systemWALPOLE WATER DEPTMA4307000 · MA
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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 | WALPOLE WATER DEPT |
|---|---|
| System | WALPOLE WATER DEPT |
| Place | Walpole |
| Population served | 24,070 |
| Source type | Groundwater |
| Record updated | 2026-09-16 |
| Findings on record | 31 |
| Above a listed reference | 0 |
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 | WALPOLE WATER DEPT |
|---|---|
| Perfluorobutanoic acid (PFBA)No federal or state limit; shown for transparency | 16ng/LDetected, no limit |
| Perfluoroheptanoic acid (PFHpA)No federal or state limit; shown for transparency | 3ng/LDetected, no limit |
| Perfluorohexanoic acid (PFHxA)400000.0 ng/L Michigan EGLE state MCL (strictest US state) | 7ng/LDetected, within reference |
| Perfluorooctanoic acid (PFOA)4.0 ng/L federal MCL (2024) | 4ng/LDetected, within reference |
| Perfluorooctanesulfonic acid (PFOS)4.0 ng/L federal MCL (2024) | 4ng/LDetected, within reference |
| Perfluoropentanoic acid (PFPeA)No federal or state limit; shown for transparency | 12ng/LDetected, no limit |
| Lead (90th percentile)15 µg/L federal action level | 1.8µg/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.