1
Hard water (16.7 gpg) can cause scale buildup in pipes and appliances but is generally safe to drink.
2
Chlorine levels are within EPA limits but may affect taste and smell.

Current Score

73 / 100

Moderate

"Good" threshold (70)

San Antonio tap water is sourced from Edwards Aquifer groundwater and treated by San Antonio Water System SAWS. Water hardness is very hard at 16.7 GPG which may cause scale buildup. TDS is 585 ppm which is above the EPA secondary guideline of 500 ppm. Overall purity score: 73/100 (Moderate). Updated for 2026.

Need a Filter?

We've matched the best filters for San Antonio's specific water issues.

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The Best Water Filter For San Antonio Homes

Matched to local water issues and filtration standards.

Best for San Antonio

iSpring WGB32B 3-Stage Whole House

Whole-House Carbon Filter

Price Range $230–270

Top Pick for San Antonio

iSpring WGB32B 3-Stage Whole House

San Antonio has very hard water (16.7 GPG) and elevated chlorine. A whole-house carbon plus softener system handles both.

Why this fits San Antonio

Reduces hardness from 16.7 GPG to soft water
Whole-house chlorine and chloramine removal
Protects all appliances pipes and water heaters

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Also Recommended

AFWFilters 5600sxt 48,000 Grain Softener

Salt-Based Water Softener — $650–750

Buy on Amazon

Want to know exactly what's in YOUR tap?

City reports show averages. Your home may be different — especially with older pipes.

Buy Test Kit on Amazon ($25–30)

Frequently Asked Questions

Is San Antonio TX tap water safe to drink in 2026?

San Antonio tap water meets EPA federal drinking water standards and scores 73/100 (Moderate) on PurityMap for 2026. For most healthy adults the water is considered safe but point-of-use filtration adds an important layer of protection.

Does San Antonio TX use chlorine or chloramine for disinfection?

San Antonio uses chloramine as the primary disinfectant with a residual level of 1.6 ppm. Chloramine is harder to remove than free chlorine and requires a catalytic carbon or reverse osmosis filter. Standard Brita-style pitchers will NOT remove chloramine.

How hard is San Antonio TX water and what is the TDS level?

San Antonio water hardness is 16.7 grains per gallon (very hard) with a TDS of 585 ppm (unacceptable). This level causes noticeable scale buildup in water heaters kettles and dishwashers. A water softener is recommended to protect plumbing and reduce soap usage.

Has PFAS been found in San Antonio TX drinking water?

Based on available EPA UCMR5 monitoring data as of 2026 PFAS have not been detected above EPA advisory levels in San Antonio drinking water.