Well Water vs City Water

Different sources need different solutions.

Key Differences

Factor	City Water	Well Water
Treatment	Treated and tested by municipality	Untreated—your responsibility
Regulation	EPA regulated, annual reports required	No regulation for private wells
Common issues	Chlorine, lead (from pipes), PFAS	Bacteria, iron, sulfur, nitrates, hardness
Testing	City provides annual report	Owner must arrange testing

City Water Filtration

Municipal water is treated, so your concerns are typically:

Chlorine: Added for disinfection, causes taste/odor issues. Easy fix with any carbon filter.
Lead: From old pipes between water main and your tap. Test if home is pre-1986. Requires NSF 53 certified filter.
PFAS: Industrial chemicals in many water supplies. Check your CCR report. RO or specialized carbon removes them.
Disinfection byproducts: Created when chlorine reacts with organic matter. Carbon filters reduce these.

Best filters for city water:

Basic needs: Quality carbon pitcher or faucet filter
Better protection: Under-sink multi-stage carbon system
Maximum purity: Reverse osmosis

Well Water Filtration

Well water is untreated and can have serious issues. Always test before choosing a system.

Common well water problems:

Bacteria (coliform, E. coli): Serious health risk. Requires UV treatment or chlorination.
Iron: Causes orange staining. Needs oxidation filter or water softener.
Sulfur: Rotten egg smell. Requires air injection or oxidation system.
Hardness: Scale buildup. Needs water softener.
Nitrates: From agricultural runoff. Requires RO or ion exchange.
Sediment: Sand, silt, debris. Requires sediment pre-filter.

Best filters for well water:

Bacteria concerns: UV disinfection system
Iron/sulfur: Air injection oxidation system (like SpringWell)
Comprehensive: Whole house system + UV + water softener if needed

Warning: Don't use a city water filter for well water without testing first. Well water can have bacteria that standard carbon filters won't address. Get your water tested annually.

Testing Requirements

City water:

Request your annual Consumer Confidence Report (CCR) from your water utility—it's free. Consider additional lead testing if you have old pipes.

Well water:

Test annually for:

Bacteria (coliform, E. coli) — every year
Nitrates — every year
Full panel (metals, pH, hardness) — every 3-5 years

Have Well Water?

See our specialized recommendations

Best Well Water Filters →