1
With a hardness of 16.7 GPG, San Antonio residents may notice white scale on faucets. Hard water increases maintenance costs.
2
Chlorine levels may affect the taste of San Antonio's tap water. A carbon filter improves flavor.

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.

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Best filters matched to San Antonio's 3 issues.

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MATCHED TO SAN ANTONIO'S WATER DATA

Best Water Filters for San Antonio, TX (2026)

Matched to Very Hard Water (16.7 GPG), Moderate Chlorine in San Antonio.

Very Hard Water (16.7 GPG) Moderate Chlorine

Best Overall #1 for San Antonio

AFWFilters 5600sxt 48000 Grain Softener

Salt-Based Water Softener

$650-750

Why this fits San Antonio

Handles San Antonio's hard water (Very Hard Water (16.7 GPG))
Premium quality at $650-750

Pros & Cons +

48000 grain capacity handles very hard water

Digital metered valve saves salt

Requires salt refills monthly

Does not remove contaminants

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Best Value

Clearly Filtered Water Pitcher

Pitcher Filter

$80-95

Why this fits San Antonio

Eliminates chlorine taste and odor from San Antonio's water
NSF/ANSI 42 + NSF/ANSI 53 + NSF/ANSI 401 certified
Budget-friendly at $80-95

Pros & Cons +

No installation fill and pour

Removes 365+ contaminants including PFAS

Small capacity 2-3 people

Filter replacements every 4 months

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Best for Taste

Waterdrop 10UA Under-Sink Filter

Under-Sink Carbon Filter

$40-60

Why this fits San Antonio

Eliminates chlorine taste and odor from San Antonio's water
NSF/ANSI 42 certified
Budget-friendly at $40-60

Pros & Cons +

Very affordable

Easy DIY install no plumber

Does not remove PFAS or hardness

Single point of use only

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Also Recommended

Waterdrop G3P800 Tankless RO

Tankless Reverse Osmosis

$380-450

Why this fits San Antonio

Eliminates chlorine taste and odor from San Antonio's water
NSF/ANSI 58 + NSF 372 certified
Premium quality at $380-450

Pros & Cons +

No tank saves cabinet space

800 GPD fast flow rate

Higher upfront cost

Filter replacements are proprietary

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As an Amazon Associate, PurityMap may earn from qualifying purchases. Based on latest San Antonio water data.

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City data shows averages. Your home may differ.

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San Antonio Water FAQ

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.

What is the best water filter for San Antonio?

Based on San Antonio's water profile, we recommend the AFWFilters 5600sxt 48000 Grain Softener. San Antonio has very hard water (16.7 GPG) and elevated chlorine. A whole-house carbon plus softener system handles both.

Nearby Reports

HoustonTexas — 59/100 DallasTexas — 64/100 College StationTexas — 69/100 LubbockTexas — 71/100 MidlandTexas — 73/100 OdessaTexas — 73/100

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Data Sources

EPA SDWIS
EWG Tap Water Database
San Antonio Water System SAWS CCR
USGS monitoring data

PurityMap compiles public data. Updated March 2026.

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