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Water Hardness in 37620

Bristol, Tennessee · Sullivan County

19 PPM
1.1 GPG
Soft
0Soft60120180300+
High Confidence — USGS Monitoring

Dataset updated March 9, 2026Matched to 7 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 7 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
2 USGS-backed sources
7 matched systems total for this ZIP; USGS monitoring is used where treated-water reports are unavailable.
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 37620

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.

7 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.
Kingsport Water Dept
TN0000349
Soft
3 PPMsurface water106,765 servedEstimated — Nearby Data
Bristol Department Of Utilities
TN0000073
Soft
3 PPMsurface water37,648 servedEstimated — County Avg
Blountville Utility District
TN0000058
Soft
3 PPMsurface water15,647 servedEstimated — Nearby Data
Bloomingdale Utility District
TN0000056
Soft
3 PPMsurface water13,318 servedEstimated — Nearby Data
South Fork Utility District
TN0000644
Soft
3 PPMsurface water7,645 servedHigh Confidence — USGS Monitoring
Showing the first 5 systems. Expand to review all matched systems.

Nearby Zip Codes

242013376183242023242114376883376433376173242703376943376863242103376833

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 Bristol, TN (37620).

Submit Your Data

Frequently Asked Questions

Is the water hard in Bristol, TN (37620)?

The average water hardness in 37620 is 19 PPM (1.1 GPG), which is classified as soft.

Do I need a water softener in 37620?

At 19 PPM, your water is relatively soft. A water softener is generally not necessary.

Is hard water in 37620 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 37620?

Zip code 37620 in Bristol, Tennessee is served by 7 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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