Is tap water safe in Cookeville?

EPA SDWIS shows no active health-based violation in this profile's reporting window. That is not the same as proving every contaminant is absent, and federal data can lag state and utility records.

How hard is the water in Cookeville, TN?

Nearby USGS observations produce an estimate of 132.5 ppm (7.7 grains per gallon), classified as hard. This is not a tap measurement.

Do I need a water softener in ZIP code 38503?

At 132.5 ppm, a correctly sized whole-house softener can reduce scale buildup and hard-water spotting. Treatment for hardness does not remove all health-related contaminants.

City water profile

Cookeville water quality

Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Cookeville, Tennessee.

Median indexed hardness

132PPM

4 indexed ZIPs

Range 131.5–132.5 PPM

State comparison: 82 PPM above
State hardness rank: #56 of 222
Matched utilities: 1
Active health records: 0

City summary

What the indexed records say

Cookeville has 4 published ZIP profiles across Putnam County. The indexed median is 132 PPM, compared with 50 PPM across Tennessee.

Among the 222 Tennesseecities with an indexed median, Cookeville ranks #56from highest to lowest. Across all 323 state ZIP profiles, available estimates run from 4.5to 247 PPM.

The 131.5–132.5 PPM range shows how much the available ZIP estimates vary within the city label.

Hardness distribution

How local ZIP estimates compare

Soft0 ZIPs

Moderately hard0 ZIPs

Hard4 ZIPs

Very hard0 ZIPs

4 of 4 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance: 12.1 miles
Profiles with evidence: 4/4

Confidence labels

High: 0Moderate: 4Low: 0

Cookeville Water Dept

PWSID TN0000133

Surface water

System population served: 49,711
Last reported: May 14, 2026

The system names this served city; Census place overlap links the city to this 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.

Record	System	Period	Status
Consumer Confidence Rule	TN0000133	Jul 1, 2022	Resolved

Practical next steps

Move from index to evidence

1. Open your ZIP. Check distance, dates, confidence, and the associated utility.
2. Read the current CCR. Confirm source water, detections, limits, ranges, and notices.
3. Test the tap when needed. Confirm health concerns or treatment sizing with the right method.

Continue comparing

Other Tennessee communities

Baxter

Putnam County

133 PPM median

Monterey

Putnam County

140 PPM median

Dowelltown

Dekalb County

132 PPM median

Alexandria

Dekalb County

133 PPM median

Brentwood

Williamson County

133 PPM median

Liberty

Dekalb County

131 PPM median

Search all 222 Tennessee cities →

Questions people ask

About water in Cookeville

Is the water hard?

The indexed city median is 132 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.