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City water profile

Ada water quality

Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Ada, Oklahoma.

Median indexed hardness

36PPM

2 indexed ZIPs

Range 9.5–61.8 PPM

State comparison
190 PPM below
State hardness rank
#104 of 108
Matched utilities
1
Active health records
0

City summary

What the indexed records say

Ada has 2 published ZIP profiles across Pontotoc County. The indexed median is 36 PPM, compared with 226 PPM across Oklahoma.

Among the 108 Oklahomacities with an indexed median, Ada ranks #104from highest to lowest. Across all 148 state ZIP profiles, available estimates run from 7to 610 PPM.

The 9.5–61.8 PPM range shows how much the available ZIP estimates vary within the city label. At least one estimate is marked low confidence, so observation distance and date deserve extra attention.

Hardness distribution

How local ZIP estimates compare

Soft1 ZIP
Moderately hard1 ZIP
Hard0 ZIPs
Very hard0 ZIPs

2 of 2 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance
33.2 miles
Profiles with evidence
2/2

Confidence labels

High: 0Moderate: 1Low: 1

Observation window: Dec 7, 2016 to Aug 6, 2018.

ZIP directory

Water reports in Ada

Open a ZIP for site-level provenance and measurements.

ZIP code

74820

Moderately Hard

61.8 PPM

Nearest site
16.8 mi
Confidence
Moderate

View full ZIP evidence →

ZIP code

74871

Soft

9.5 PPM

Nearest site
33.2 mi
Confidence
Low

View full ZIP evidence →

Public water systems

Utilities associated with this city

Ada

PWSID OK2006201

Groundwater
System population served
22,600
Last reported
May 13, 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 RuleOK2006201Jul 1, 2025Resolved
LEAD AND COPPER RULE REVISIONSOK2006201Oct 17, 2024Resolved · health-based
LEAD AND COPPER RULE REVISIONSOK2006201Oct 17, 2024Resolved

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 Ada

Is the water hard?

The indexed city median is 36 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.