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Water Hardness in 37912

Knoxville, Tennessee · Knox County

50 PPM
2.9 GPG
Soft
0Soft60120180300+
Verified — Annual Water Quality Report

Dataset updated March 9, 2026Matched to 6 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 6 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
6 verified treated-water sources
6 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 37912

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.

6 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.
Knoxville Utilities Board - Kub
TN0000366
Soft
50 PPMsurface water254,671 servedVerified — Annual Water Quality Report
Source water: 10 PPM
First U.D. Of Knox County
TN0000369
Soft
50 PPMsurface water115,531 servedVerified — Annual Water Quality Report
Source water: 10 PPM
Hallsdale-Powell U.D.
TN0000280
Soft
50 PPMsurface water84,315 servedVerified — Annual Water Quality Report
Source water: 10 PPM
West Knox Utility District
TN0000371
Soft
50 PPMsurface water77,825 servedVerified — Annual Water Quality Report
Source water: 10 PPM
Knox-Chapman Utility District
TN0000367
Soft
50 PPMsurface water41,311 servedVerified — Annual Water Quality Report
Source water: 10 PPM
Showing the first 5 systems. Expand to review all matched systems.

Nearby Zip Codes

379215037917503784950379095037902503791650379185037915503791950379235037931503793850

What This Means For You

Recommendations are based on the displayed ZIP hardness reading. Confirm your tap reading before sizing or buying treatment equipment.

Your Water Is Soft

Your water hardness is in the soft range. You likely don't need a water softener. Enjoy your naturally soft 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 Knoxville, TN (37912).

Submit Your Data

Frequently Asked Questions

Is the water hard in Knoxville, TN (37912)?

The average water hardness in 37912 is 50 PPM (2.9 GPG), which is classified as soft.

Do I need a water softener in 37912?

At 50 PPM, your water is relatively soft. A water softener is generally not necessary.

Is hard water in 37912 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 37912?

Zip code 37912 in Knoxville, Tennessee is served by 6 water systems.

Learn More About Your Water

Water Hardness Scale: PPM and GPG Chart

Use the USGS water hardness scale to compare PPM, GPG, and mg/L levels from soft to very hard water.

10 min read

How to Test Water Hardness at Home

Compare free lookups, soap tests, test strips, liquid drop kits, and lab tests for measuring water hardness.

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