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City water profile

Sonora water quality

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

Median indexed hardness

294PPM

One indexed ZIP

Range 294–294 PPM

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

City summary

What the indexed records say

Sonora has 1 published ZIP profile across Sutton County. The indexed median is 294 PPM, compared with 111 PPM across Texas.

Among the 523 Texascities with an indexed median, Sonora ranks #67from highest to lowest. Across all 1,026 state ZIP profiles, available estimates run from 5.4to 500.5 PPM.

Because only one ZIP is represented, the city median and range are the same local estimate. It should not be read as multiple independent samples across the community.

Hardness distribution

How local ZIP estimates compare

Soft0 ZIPs
Moderately hard0 ZIPs
Hard0 ZIPs
Very hard1 ZIP

1 of 1 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance
10.4 miles
Profiles with evidence
1/1

Confidence labels

High: 0Moderate: 1Low: 0

Observation window: Nov 14, 2016 to Jul 13, 2017.

ZIP directory

Water reports in Sonora

Open a ZIP for site-level provenance and measurements.

ZIP code

76950

Very Hard

294 PPM

Nearest site
10.4 mi
Confidence
Moderate

View full ZIP evidence →

Public water systems

Utilities associated with this city

City Of Sonora

PWSID TX2180001

Groundwater
System population served
2,766
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.

RecordSystemPeriodStatus
Consumer Confidence RuleTX2180001Jul 1, 2025Unaddressed
Public NoticeTX2180001May 15, 2025Resolved
LEAD AND COPPER RULE REVISIONSTX2180001Oct 17, 2024Resolved
LEAD AND COPPER RULE REVISIONSTX2180001Oct 17, 2024Resolved · health-based
Public NoticeTX2180001Sep 19, 2024Unaddressed
ChlorineTX2180001Apr 1, 2023Resolved
Public NoticeTX2180001Dec 19, 2021Resolved
Revised Total Coliform RuleTX2180001Sep 1, 2021Resolved
Lead and Copper RuleTX2180001Dec 30, 2020Unaddressed

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 Sonora

Is the water hard?

The indexed city median is 294 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.