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City water profile

Knox water quality

Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Knox, Pennsylvania.

Median indexed hardness

164PPM

One indexed ZIP

Range 164–164 PPM

State comparison
80 PPM above
State hardness rank
#2 of 50
Matched utilities
1
Active health records
0

City summary

What the indexed records say

Knox has 1 published ZIP profile across Clarion County. The indexed median is 164 PPM, compared with 84 PPM across Pennsylvania.

Among the 50 Pennsylvaniacities with an indexed median, Knox ranks #2from highest to lowest. Across all 139 state ZIP profiles, available estimates run from 43to 166.5 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
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
11.3 miles
Profiles with evidence
1/1

Confidence labels

High: 0Moderate: 1Low: 0

Observation window: Mar 22, 2016 to May 29, 2026.

ZIP directory

Water reports in Knox

Open a ZIP for site-level provenance and measurements.

ZIP code

16232

Hard

164 PPM

Nearest site
11.3 mi
Confidence
Moderate

View full ZIP evidence →

Public water systems

Utilities associated with this city

Knox Water Works

PWSID PA6160005

Groundwater
System population served
1,380
Last reported
Jun 15, 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
Groundwater RulePA6160005Jan 1, 2026Resolved
NitratePA6160005Jan 1, 2025Archived
NitritePA6160005Jan 1, 2025Archived
Groundwater RulePA6160005Aug 1, 2024Resolved
NitritePA6160005Jan 1, 2022Resolved
NitratePA6160005Jan 1, 2022Resolved
Groundwater RulePA6160005Apr 1, 2021Archived
Groundwater RulePA6160005Feb 1, 2021Resolved

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 Knox

Is the water hard?

The indexed city median is 164 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.