Skip to content

City water profile

San Antonio water quality

Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for San Antonio, Texas.

Median indexed hardness

178PPM

57 indexed ZIPs

Range 174–182 PPM

State comparison
67 PPM above
State hardness rank
#239 of 523
Matched utilities
1
Active health records
0

City summary

What the indexed records say

San Antonio has 57 published ZIP profiles across Bexar County. The indexed median is 178 PPM, compared with 111 PPM across Texas.

Among the 523 Texascities with an indexed median, San Antonio ranks #239from highest to lowest. Across all 1,026 state ZIP profiles, available estimates run from 5.4to 500.5 PPM.

The 174–182 PPM range shows how much the available ZIP estimates vary within the city label.

Hardness distribution

How local ZIP estimates compare

Soft0 ZIPs
Moderately hard0 ZIPs
Hard40 ZIPs
Very hard17 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: 0Moderate: 57Low: 0

Observation window: Jan 21, 2016 to Jun 20, 2026.

ZIP directory

Water reports in San Antonio

Open a ZIP for site-level provenance and measurements.

ZIP code

78023

Very Hard

182 PPM

Nearest site
4.9 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78073

Hard

178 PPM

Nearest site
6.4 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78112

Hard

174 PPM

Nearest site
4.2 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78201

Hard

178 PPM

Nearest site
6.4 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78202

Hard

178 PPM

Nearest site
8.7 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78203

Hard

174 PPM

Nearest site
8.4 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78204

Hard

178 PPM

Nearest site
5.6 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78205

Hard

178 PPM

Nearest site
7.2 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78207

Hard

178 PPM

Nearest site
4.9 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78208

Hard

174 PPM

Nearest site
9.2 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78209

Hard

174 PPM

Nearest site
7.8 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78210

Hard

178 PPM

Nearest site
7.6 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78211

Very Hard

182 PPM

Nearest site
1.2 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78212

Hard

178 PPM

Nearest site
7.9 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78213

Hard

178 PPM

Nearest site
6.3 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78214

Hard

178 PPM

Nearest site
6.6 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78215

Hard

178 PPM

Nearest site
8 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78216

Hard

178 PPM

Nearest site
4.3 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78217

Hard

174 PPM

Nearest site
5.4 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78218

Hard

174 PPM

Nearest site
7.9 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78219

Hard

174 PPM

Nearest site
8.8 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78220

Hard

174 PPM

Nearest site
10.2 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78221

Hard

174 PPM

Nearest site
6.2 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78222

Hard

174 PPM

Nearest site
6.2 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78223

Hard

174 PPM

Nearest site
3.3 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78224

Hard

174 PPM

Nearest site
2.7 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78225

Hard

178 PPM

Nearest site
3.9 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78226

Hard

178 PPM

Nearest site
1.6 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78227

Very Hard

182 PPM

Nearest site
1.8 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78228

Very Hard

182 PPM

Nearest site
4.3 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78229

Very Hard

182 PPM

Nearest site
6.2 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78230

Very Hard

182 PPM

Nearest site
4.1 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78232

Hard

178 PPM

Nearest site
0.7 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78233

Hard

174 PPM

Nearest site
6.5 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78234

Hard

174 PPM

Nearest site
9.9 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78235

Hard

174 PPM

Nearest site
6.4 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78237

Very Hard

182 PPM

Nearest site
2.6 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78238

Very Hard

182 PPM

Nearest site
4.6 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78240

Very Hard

182 PPM

Nearest site
4.7 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78242

Hard

178 PPM

Nearest site
1.6 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78243

Hard

178 PPM

Nearest site
0.6 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78244

Hard

174 PPM

Nearest site
5.7 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78245

Very Hard

182 PPM

Nearest site
7.1 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78247

Hard

174 PPM

Nearest site
4.1 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78248

Hard

178 PPM

Nearest site
1.8 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78249

Very Hard

182 PPM

Nearest site
2.1 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78250

Very Hard

182 PPM

Nearest site
5.5 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78251

Hard

178 PPM

Nearest site
5.7 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78252

Very Hard

182 PPM

Nearest site
4.4 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78253

Very Hard

182 PPM

Nearest site
5.2 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78254

Very Hard

182 PPM

Nearest site
1.6 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78256

Very Hard

182 PPM

Nearest site
2.6 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78257

Very Hard

182 PPM

Nearest site
1.5 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78258

Hard

178 PPM

Nearest site
2 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78259

Hard

174 PPM

Nearest site
1.6 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78261

Hard

174 PPM

Nearest site
5 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

78264

Hard

178 PPM

Nearest site
7.7 mi
Confidence
Moderate

View full ZIP evidence →

Public water systems

Utilities associated with this city

San Antonio Water System

PWSID TX0150018

Surface water
System population served
2,643,729
Last reported
Jun 26, 2026

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

Compliance history

What EPA records show

No active health-based violation appears among the associated systems in the represented EPA reporting quarter. This does not mean every contaminant was tested at every tap.

No violation records are included in the current lookback window.

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. Test the tap when needed. Confirm health concerns or treatment sizing with the right method.

Questions people ask

About water in San Antonio

Is the water hard?

The indexed city median is 178 PPM. Open the ZIP report to verify the distance and confidence behind that estimate.

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.