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City water profile

Hillsboro water quality

Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Hillsboro, Ohio.

Median indexed hardness

334PPM

One indexed ZIP

Range 333.5–333.5 PPM

State comparison
108 PPM above
State hardness rank
#33 of 119
Matched utilities
1
Active health records
0

City summary

What the indexed records say

Hillsboro has 1 published ZIP profile across Highland County. The indexed median is 334 PPM, compared with 226 PPM across Ohio.

Among the 119 Ohiocities with an indexed median, Hillsboro ranks #33from highest to lowest. Across all 162 state ZIP profiles, available estimates run from 77.2to 387 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
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
51.9 miles
Profiles with evidence
1/1

Confidence labels

High: 0Moderate: 0Low: 1

Observation window: Aug 27, 2018 to Dec 4, 2024.

ZIP directory

Water reports in Hillsboro

Open a ZIP for site-level provenance and measurements.

ZIP code

45133

Very Hard

333.5 PPM

Nearest site
51.9 mi
Confidence
Low

View full ZIP evidence →

Public water systems

Utilities associated with this city

Hillsboro City

PWSID OH3600614

Surface water
System population served
6,650
Last reported
May 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
LEAD AND COPPER RULE REVISIONSOH3600614Jul 2, 2025Resolved
Consumer Confidence RuleOH3600614Sep 5, 2024Resolved
CARBON, TOTALOH3600614Apr 1, 2022Resolved
Consumer Confidence RuleOH3600614Feb 10, 2020Unaddressed
Consumer Confidence RuleOH3600614Nov 2, 2018Unaddressed

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 Hillsboro

Is the water hard?

The indexed city median is 334 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.