Water Hardness in 37748
Harriman, Tennessee · Roane County
Dataset updated March 9, 2026Matched to 6 water systemsTap readings can vary by utility zone, treatment, and plumbing. Methodology
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.
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 37748
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.
| Water System | Source | Hardness | Pop. Served |
|---|---|---|---|
Harriman Utility Board TN0000287 | surface water | 87 PPM Slightly Hard | |
Watts Bar Utility District TN0000872 | surface water | 162 PPM Moderately Hard | |
Rockwood Water, Sewer & Gas TN0000590 | surface water | 20 PPM Soft | |
Kingston Water System TN0000360 | surface water | 162 PPM Moderately Hard | |
Cumberland Utility District TN0000531 | surface water | 87 PPM Slightly Hard |
Nearby Zip Codes
What This Means For You
Recommendations are based on the displayed ZIP hardness reading. Confirm your tap reading before sizing or buying treatment equipment.
Slightly Hard Water
Your water is slightly hard. You may notice minor spotting on dishes or a slight film on faucets. A water softener is optional but can improve water quality.
Recommended Products
Learn more: Do I Need a Water Softener? | Salt-Based vs Salt-Free | How 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 Harriman, TN (37748).
Frequently Asked Questions
Is the water hard in Harriman, TN (37748)?
The average water hardness in 37748 is 105 PPM (6.1 GPG), which is classified as slightly hard.
Do I need a water softener in 37748?
At 105 PPM, your water is relatively soft. A water softener is generally not necessary.
Is hard water in 37748 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 37748?
Zip code 37748 in Harriman, Tennessee is served by 6 water systems.
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