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Tell us your location, water source, and main concern. We may need your supplier name before preparing a report. ZIP codes can cross supplier boundaries. We do not provide emergency monitoring.
- ✓ Segmented by ZIP/town and water source
- ✓ Practical test/filter recommendations
- ✓ Urgent problem? Contact your supplier; do not wait for our report
Highest-value buying guides
Start with the guides that prevent expensive filter mistakes.
These guides cover the decisions that matter most: testing first, RO for drinking-water contaminants, and whole-house systems for larger home filtration upgrades.
Best Water Test Kits
Lead, PFAS, wells, city water, hardness, and pre-filter buying decisions.
Best Reverse Osmosis Systems
RO picks for PFAS, lead, nitrates, TDS, and kitchen drinking water.
Best Whole House Filters
Larger-capacity systems for chlorine smell, sediment, shower water, and whole-home comfort.
State Hubs
Explore statewide contamination priorities and city-level pages.
Technical Intelligence Hub
In-depth analysis of contaminant mechanics, brand comparisons, and emerging chemical threats.
RO vs. PFAS
Technical efficacy of RO for PFAS removal.
Brita & Lead
Understanding NSF 53 vs NSF 42 certifications.
Berkey vs. PFAS
Gravity filtration vs. molecular mobility.
Microplastics Removal
Advanced protocols for nanoplastic mitigation.
Arsenic Geochemistry
Redox potential and pH dynamics in aquifers.
Official Advisory Information
Find official advisory information; current status must be checked with your supplier.
New York City Pages
Florida City Pages
New Jersey City Pages
Core Reference Guides
Start with Testing
If you are not sure which filter type you need, test first. Home and lab-backed kits help you avoid overpaying and choose the right system for your actual contaminant profile.
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