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City water profile

Water hardness in San Antonio

Find official utility reports, understand hardness, and check the water system serving your home in San Antonio, Texas.

Utility-reported hardness

Not yet available

Check your provider and source →
State comparison
41 PPM above
Evidence comparison rank
#3 of 15
Matched utilities
1
Active health records
0

Your tap water

What does the utility report?

Match the utility name to your water bill. These results describe the utility’s water, not a test at your home. A ZIP can include several water systems.

Utility hardness unavailable in this index

Nearby river or groundwater samples cannot tell us the hardness coming out of your tap. Ask your water provider for total hardness as CaCO₃, or test it at home.

Find an official utility report →
Convert a hardness result →Test your tap →

Match the name on your water bill

Your utility’s measurements and compliance records

These are possible serving systems. A record for one system does not apply to every home in this ZIP. Confirm your provider before interpreting a measurement or notice. Federal records can lag current utility notices.

EPA snapshot: 2026Q2. Historical window begins Jan 1, 2021.

San Antonio Water System

TX0150018 · Surface water · 2,643,729 people served system-wide

A municipal system, in-state city, and served county all agree with this Census ZCTA.

No active health-based record in this imported snapshot

Find this utility’s official report →
Measurements (1)

An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.

Lead (90th percentile)

EPA SDWIS Lead and Copper Rule samples

Below action level
Reported level
0.0016 mg/L
Action level
0.015 mg/L

11% of the listed benchmark

Monitoring period: Jan 1, 2022 to Dec 31, 2024

Violation history (0)

No record returned in this imported window. This is not a guarantee of tap-water safety.

City summary

What the indexed records say

San Antonio has 57 published ZIP profiles across Bexar County. The regional-evidence median is 159 PPM. Its comparison-eligible median is 159 PPM versus 118 PPM statewide.

Among the 15 Texascities meeting the comparison standard, San Antonio ranks #3from highest to lowest. Across all 1,026 state ZIP profiles, available estimates run from 23.6to 310 PPM.

The 96.2–277.5 PPM range shows how much the available ZIP estimates vary within the city label.

Hardness distribution

How local ZIP estimates compare

Soft0 ZIPs
Moderately hard1 ZIP
Hard53 ZIPs
Very hard3 ZIPs

57 of 57 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance
5.2 miles
Profiles with evidence
57/57

Confidence labels

High: 56Moderate: 1Low: 0

Observation window: Sep 20, 2016 to Jun 20, 2026.

ZIP directory

Water reports in San Antonio

Open a ZIP for site-level provenance and measurements.

ZIP code

78023

Hard

138.5 PPM

Nearest site
4.9 mi
Confidence
High

View full ZIP evidence →

ZIP code

78073

Very Hard

268 PPM

Nearest site
6.4 mi
Confidence
High

View full ZIP evidence →

ZIP code

78112

Very Hard

277 PPM

Nearest site
4.2 mi
Confidence
High

View full ZIP evidence →

ZIP code

78201

Hard

159 PPM

Nearest site
6.4 mi
Confidence
High

View full ZIP evidence →

ZIP code

78202

Hard

159 PPM

Nearest site
8.7 mi
Confidence
High

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ZIP code

78203

Hard

159 PPM

Nearest site
8.4 mi
Confidence
High

View full ZIP evidence →

ZIP code

78204

Hard

159 PPM

Nearest site
5.6 mi
Confidence
High

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ZIP code

78205

Hard

159 PPM

Nearest site
7.2 mi
Confidence
High

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ZIP code

78207

Hard

159 PPM

Nearest site
4.9 mi
Confidence
High

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ZIP code

78208

Hard

159 PPM

Nearest site
9.2 mi
Confidence
High

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ZIP code

78209

Hard

159 PPM

Nearest site
7.8 mi
Confidence
High

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ZIP code

78210

Hard

159 PPM

Nearest site
7.6 mi
Confidence
High

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ZIP code

78211

Hard

159 PPM

Nearest site
1.2 mi
Confidence
High

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ZIP code

78212

Hard

159 PPM

Nearest site
7.9 mi
Confidence
High

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ZIP code

78213

Hard

159 PPM

Nearest site
6.3 mi
Confidence
High

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ZIP code

78214

Hard

159 PPM

Nearest site
6.6 mi
Confidence
High

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ZIP code

78215

Hard

159 PPM

Nearest site
8 mi
Confidence
High

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ZIP code

78216

Hard

159 PPM

Nearest site
4.3 mi
Confidence
High

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ZIP code

78217

Hard

159 PPM

Nearest site
5.4 mi
Confidence
High

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ZIP code

78218

Hard

159 PPM

Nearest site
7.9 mi
Confidence
High

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ZIP code

78219

Hard

159 PPM

Nearest site
8.8 mi
Confidence
High

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ZIP code

78220

Hard

159 PPM

Nearest site
10.2 mi
Confidence
Moderate

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ZIP code

78221

Hard

159 PPM

Nearest site
6.2 mi
Confidence
High

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ZIP code

78222

Hard

159.5 PPM

Nearest site
6.2 mi
Confidence
High

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ZIP code

78223

Hard

160 PPM

Nearest site
3.3 mi
Confidence
High

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ZIP code

78224

Hard

159 PPM

Nearest site
2.7 mi
Confidence
High

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ZIP code

78225

Hard

159 PPM

Nearest site
3.9 mi
Confidence
High

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ZIP code

78226

Hard

159 PPM

Nearest site
1.6 mi
Confidence
High

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ZIP code

78227

Hard

158 PPM

Nearest site
1.8 mi
Confidence
High

View full ZIP evidence →

ZIP code

78228

Hard

159 PPM

Nearest site
4.3 mi
Confidence
High

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ZIP code

78229

Hard

159 PPM

Nearest site
6.2 mi
Confidence
High

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ZIP code

78230

Hard

159 PPM

Nearest site
4.1 mi
Confidence
High

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ZIP code

78232

Hard

159 PPM

Nearest site
0.7 mi
Confidence
High

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ZIP code

78233

Hard

159 PPM

Nearest site
6.5 mi
Confidence
High

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ZIP code

78234

Hard

159 PPM

Nearest site
9.9 mi
Confidence
High

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ZIP code

78235

Hard

159 PPM

Nearest site
6.4 mi
Confidence
High

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ZIP code

78237

Hard

159 PPM

Nearest site
2.6 mi
Confidence
High

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ZIP code

78238

Hard

159 PPM

Nearest site
4.6 mi
Confidence
High

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ZIP code

78240

Hard

159 PPM

Nearest site
4.7 mi
Confidence
High

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ZIP code

78242

Hard

158 PPM

Nearest site
1.6 mi
Confidence
High

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ZIP code

78243

Hard

159 PPM

Nearest site
0.6 mi
Confidence
High

View full ZIP evidence →

ZIP code

78244

Hard

159 PPM

Nearest site
5.7 mi
Confidence
High

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ZIP code

78245

Hard

159 PPM

Nearest site
7.1 mi
Confidence
High

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ZIP code

78247

Hard

159 PPM

Nearest site
4.1 mi
Confidence
High

View full ZIP evidence →

ZIP code

78248

Hard

158 PPM

Nearest site
1.8 mi
Confidence
High

View full ZIP evidence →

ZIP code

78249

Hard

138.5 PPM

Nearest site
2.1 mi
Confidence
High

View full ZIP evidence →

ZIP code

78250

Hard

159 PPM

Nearest site
5.5 mi
Confidence
High

View full ZIP evidence →

ZIP code

78251

Hard

158 PPM

Nearest site
5.7 mi
Confidence
High

View full ZIP evidence →

ZIP code

78252

Hard

159 PPM

Nearest site
4.4 mi
Confidence
High

View full ZIP evidence →

ZIP code

78253

Hard

138.5 PPM

Nearest site
5.2 mi
Confidence
High

View full ZIP evidence →

ZIP code

78254

Hard

138.5 PPM

Nearest site
1.6 mi
Confidence
High

View full ZIP evidence →

ZIP code

78256

Hard

138.5 PPM

Nearest site
2.6 mi
Confidence
High

View full ZIP evidence →

ZIP code

78257

Hard

138.5 PPM

Nearest site
1.5 mi
Confidence
High

View full ZIP evidence →

ZIP code

78258

Hard

138.5 PPM

Nearest site
2 mi
Confidence
High

View full ZIP evidence →

ZIP code

78259

Hard

157 PPM

Nearest site
1.6 mi
Confidence
High

View full ZIP evidence →

ZIP code

78261

Moderately Hard

96.2 PPM

Nearest site
5 mi
Confidence
High

View full ZIP evidence →

ZIP code

78264

Very Hard

277.5 PPM

Nearest site
7.7 mi
Confidence
High

View full ZIP evidence →

Practical next steps

Move from index to evidence

  1. 1. Open your ZIP. Check distance, dates, confidence, and the associated utility.
  2. 2. Read the current CCR. Confirm source water, detections, limits, ranges, and notices.
  3. 3. Use a measured hardness result. Confirm health concerns or treatment sizing with the right method.

Questions people ask

About water in San Antonio

Is the water hard?

Check the utility-reported result above when available. Nearby environmental samples cannot establish tap-water hardness. Ask your provider or test your tap.

Is the tap water safe?

Compliance history is utility-wide and cannot guarantee conditions at every tap. Check current notices and test when address-specific evidence is needed.

Do I need treatment?

Choose treatment only after confirming the problem at the property. A softener targets hardness; contaminant treatment requires a matching, verified performance claim.