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Water Hardness in 45205

Cincinnati, Ohio · Hamilton County

140 PPM
8.2 GPG
Moderately Hard
0Soft60120180300+
Verified - Annual Water Quality Report

Dataset updated March 9, 2026Matched to 4 water systemsTap readings can vary by utility zone, treatment, and plumbing. Methodology

Source context

How this ZIP reading is built

This ZIP reading is built from 4 matched water systems. When more than one system is matched, the displayed value is weighted toward larger known service populations when that data is available.

Source basis
4 verified treated-water sources
4 matched systems total for this ZIP; treated-water reports are prioritized when available.
Water source profile
Primarily surface water
Surface-water hardness can shift with reservoirs, runoff, season, and treatment. This profile is weighted by known population served across matched systems.
Data recency
March 9, 2026
Dataset rebuilt March 9, 2026; individual utility reporting years can vary.

Hardness is a mineral-content reading, not a drinking-water safety rating. Use it for scale, appliance, and softener decisions; check your utility report or test your tap before sizing treatment equipment. See how we calculate local readings.

Water Systems Serving 45205

These are the systems matched to this ZIP code. The displayed ZIP value is weighted toward larger known service populations when population data is available.

4 water systems
PWSID is the public water system identifier. Data Source shows whether the hardness value comes from a treated-water report, USGS monitoring, or a local estimate; source year is shown when available.
Cincinnati Public Water System
OH3102612
Moderately Hard
140 PPMsurface water750,200 servedVerified - Annual Water Quality Report
Source water: 370 PPM
Norwood City Pws
OH3101703
Moderately Hard
140 PPMsurface water19,870 servedVerified - Annual Water Quality Report
Source water: 414 PPM
Indian Hill City Pws
OH3101112
Moderately Hard
140 PPMgroundwater15,000 servedVerified - Annual Water Quality Report
Source water: 317 PPM
Harrison City Pws
OH3100812
Moderately Hard
140 PPMgroundwater11,600 servedVerified - Annual Water Quality Report
Source water: 284 PPM

Nearby Zip Codes

452041404523814041016120452141404520314045225140452191404521114041011120452021404522014045223140

What This Means For You

Use this ZIP reading as a local planning estimate, not a final treatment specification. Hardness can vary by utility zone, seasonal blend, private well, and building plumbing. Confirm your tap reading with a utility report or home hardness test before sizing equipment.

MethodologyData sourcesHow to test your water

Know your water hardness?

If you've tested your water or have your utility's CCR report, share your reading to help us improve accuracy for Cincinnati, OH (45205).

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Frequently Asked Questions

Is the water hard in Cincinnati, OH (45205)?

The average water hardness in 45205 is 140 PPM (8.2 GPG), which is classified as moderately hard.

Do I need a water softener in 45205?

With hardness of 140 PPM, a water softener is worth considering for homes in 45205.

Is hard water in 45205 safe to drink?

Water hardness itself is a mineral-content reading, not a drinking-water safety rating. Calcium and magnesium are naturally occurring minerals, but you should check your utility's Consumer Confidence Report for contaminant and compliance information.

How many water systems serve 45205?

Zip code 45205 in Cincinnati, Ohio is served by 4 water systems.

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