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City water profile

Collinsville water quality

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

Median indexed hardness

137PPM

One indexed ZIP

Range 136.5–136.5 PPM

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

City summary

What the indexed records say

Collinsville has 1 published ZIP profile across Tulsa County. The indexed median is 137 PPM, compared with 226 PPM across Oklahoma.

Among the 108 Oklahomacities with an indexed median, Collinsville ranks #85from highest to lowest. Across all 148 state ZIP profiles, available estimates run from 7to 610 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. At least one estimate is marked low confidence, so observation distance and date deserve extra attention.

Hardness distribution

How local ZIP estimates compare

Soft0 ZIPs
Moderately hard0 ZIPs
Hard1 ZIP
Very hard0 ZIPs

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
71.8 miles
Profiles with evidence
1/1

Confidence labels

High: 0Moderate: 0Low: 1

Observation window: Jan 26, 2016 to Apr 20, 2026.

ZIP directory

Water reports in Collinsville

Open a ZIP for site-level provenance and measurements.

ZIP code

74021

Hard

136.5 PPM

Nearest site
71.8 mi
Confidence
Low

View full ZIP evidence →

Public water systems

Utilities associated with this city

Collinsville

PWSID OK1021505

Surface water
System population served
5,400
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
Nitrate-NitriteOK1021505Jan 1, 2025Archived
LEAD AND COPPER RULE REVISIONSOK1021505Oct 17, 2024Resolved · health-based
LEAD AND COPPER RULE REVISIONSOK1021505Oct 17, 2024Resolved
Interim Enhanced Surface Water Treatment RuleOK1021505Jul 1, 2023Resolved
1,2,4-TrichlorobenzeneOK1021505Jan 1, 2023Archived
DICHLOROMETHANEOK1021505Jan 1, 2023Archived
o-DichlorobenzeneOK1021505Jan 1, 2023Archived
p-DichlorobenzeneOK1021505Jan 1, 2023Archived
Vinyl chlorideOK1021505Jan 1, 2023Archived
trans-1,2-DichloroethyleneOK1021505Jan 1, 2023Archived

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 Collinsville

Is the water hard?

The indexed city median is 137 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.