Water Hardness in Tennessee (TN)
Tennessee has an average water hardness of 110 ppm (6.4 grains per gallon), which is classified as Slightly Hard . At this level, Tennessee residents experience minimal hard water issues. A water softener is generally not necessary, though some homeowners prefer the feel and cleaning performance of softened water. Water hardness varies between cities — from 60 ppm in Memphis to 170 ppm in Murfreesboro.
Water Hardness by City in Tennessee
The table below shows water hardness data for 8 cities in Tennessee, sorted from hardest to softest. Click any city name for detailed information including water source, treatment recommendations, and estimated hard water costs.
| City | Hardness (PPM) | Grains/Gallon | Level | Water Source | pH | TDS | Utility |
|---|---|---|---|---|---|---|---|
| Murfreesboro | 170 ppm | 9.9 gpg | Moderately Hard | Ground | 7.7 | 265 | Murfreesboro Water Resources |
| Franklin | 145 ppm | 8.5 gpg | Moderately Hard | Ground | 7.6 | 225 | City of Franklin Water Management |
| Clarksville | 110 ppm | 6.4 gpg | Slightly Hard | Surface | 7.4 | 170 | Clarksville Gas and Water |
| Nashville | 100 ppm | 5.8 gpg | Slightly Hard | Surface | 7.4 | 155 | Metro Nashville Water Services |
| Knoxville | 90 ppm | 5.3 gpg | Slightly Hard | Surface | 7.3 | 135 | Knoxville Utilities Board |
| Chattanooga | 80 ppm | 4.7 gpg | Slightly Hard | Surface | 7.2 | 120 | Tennessee American Water |
| Johnson City | 65 ppm | 3.8 gpg | Slightly Hard | Surface | 7.2 | 100 | Johnson City Water and Sewer |
| Memphis | 60 ppm | 3.5 gpg | Soft | Ground | 7.1 | 90 | Memphis Light Gas and Water |
Understanding Water Hardness in Tennessee
Water Sources in Tennessee
The majority of cities in Tennessee draw their water from surface sources such as rivers, lakes, and reservoirs. Surface water generally contains fewer dissolved minerals than groundwater, which helps explain the overall hardness profile of the state. Cities that rely on surface water tend to have softer water because the water has less contact time with mineral-bearing rock formations underground.
Hardness Variation Across Tennessee
Water hardness in Tennessee ranges from 60 ppm in Memphis to 170 ppm in Murfreesboro — a difference of 110 ppm. This variation means that treatment recommendations differ significantly between cities. Even the hardest water in Tennessee is moderate enough that a water softener is optional rather than essential, though homeowners who value spotless dishes and softer-feeling water may still find one worthwhile. Memphis has the softest water in the state, though at 60 ppm it still contains some dissolved minerals.
Recommended Treatment for Tennessee Water
Based on the average water hardness of 110 ppm in Tennessee, a water softener is not strictly necessary, but some homeowners may prefer treated water. The most effective treatment options for Tennessee's water hardness level include:
- Ion Exchange Filter Pitcher ($30 - $60) — Removes hardness minerals. Moderately effective.
- Electronic Descaler ($150 - $400) — Conditions water without removing minerals. Moderately effective.
How Tennessee Compares to Other States
Below is a comparison of Tennessee with five states that have similar average water hardness levels. Understanding how your state compares can help you gauge whether your water is typical for the region or unusually hard or soft.
| State | Avg Hardness | Level | Cities |
|---|---|---|---|
| Tennessee (TN) | 110 ppm | Slightly Hard | 8 |
| Delaware (DE) | 110 ppm | Slightly Hard | 7 |
| Louisiana (LA) | 105 ppm | Slightly Hard | 8 |
| Maryland (MD) | 115 ppm | Slightly Hard | 7 |
| Alabama (AL) | 100 ppm | Slightly Hard | 8 |
| District of Columbia (DC) | 120 ppm | Slightly Hard | 7 |
Find Your City's Water Hardness
Use our water hardness lookup tool to find your specific city in Tennessee, or browse all 50 states to compare water hardness across the country. If your water is hard, visit our treatment solutions guide to find the right softener or conditioner for your home.