Address-Level Water Intelligence
Know exactly what's in your tap water — and precisely what removes it.
Enter your home address. We identify the exact public water system that serves it, show the contaminants that utility reports against federal legal limits, and name the retail filters independently certified to remove them. No fear. No brand agenda.
Renters: your filter options may be limited to countertop and pitcher units — we'll flag that.
- EPA SDWIS federal data
- TEMM address-level service boundaries
- Independent NSF/ANSI certification
- No fear-based ratings, ever
Process
How it works
Enter your address
We resolve your location against real utility service-area polygons using point-in-polygon geometry — not a ZIP code guess that spans multiple utilities.
See what's reported
Every contaminant the utility measured, with full provenance: sample date, testing agency, unit, and the federal legal limit (MCL) beside the health goal (MCLG).
Get the exact certified filters
SKU-level recommendations, matched to your contaminants and verified against the specific NSF/ANSI standard that covers each one.
Transparency
Why we're different
| Common approaches | WaterQualityLens |
|---|---|
| ZIP-code lookups that cross several utilities | Address-level point-in-polygon geometry — one true PWS. |
| Proprietary "alarm" thresholds that inflate risk | Only federal MCL/MCLG — the actual legal limits. |
| Brands that sell the filter they diagnose | Vendor-agnostic; we hold no inventory. |
| Broad affiliate links to whatever pays | Only SKUs whose NSF certification we verified. |
ZIP-code lookups that cross several utilities
Address-level point-in-polygon geometry — one true PWS.
Proprietary "alarm" thresholds that inflate risk
Only federal MCL/MCLG — the actual legal limits.
Brands that sell the filter they diagnose
Vendor-agnostic; we hold no inventory.
Broad affiliate links to whatever pays
Only SKUs whose NSF certification we verified.
Standards
What the NSF numbers actually mean
Aesthetic effects
Chlorine taste/odor, sediment. Does not mean contaminant health removal.
Health effects
Certified reduction of specific contaminants like lead, chromium, certain PFAS.
Reverse osmosis
Broadest reduction, required for nitrate.
Lead-free materials
Lead-free plumbing materials — not contaminant removal. Commonly misread.
Emerging compounds
Pharmaceuticals, some pesticides and incidental compounds.
A filter certified only to 42 and 372 removes no health contaminants — it's just a lead-free housing. We flag those explicitly. Browse the registry or view contaminants.