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 systemJOHNSTON MUNICIPAL WATER SUPPLYIA7740011 · IA
Add a second systemoptional
Identity
Side by side
BasisEach column shows its latest public record. Sample years can differ between columns, so compare with care.
| Field | JOHNSTON MUNICIPAL WATER SUPPLY |
|---|---|
| System | JOHNSTON MUNICIPAL WATER SUPPLY |
| Place | Johnston Supply |
| Population served | 24,897 |
| 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 | JOHNSTON MUNICIPAL WATER SUPPLY |
|---|---|
| Lithium10.0 µg/L EPA health reference level (screening, not a legal limit) | 33µg/LAbove a 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.