Public water system
Erwin Utilities Authority
PWSID TN0000231 - Unicoi County, Tennessee
98 PPM
5.7 GPG
Slightly Hard0Soft60120180300+
Slightly Hard (98 PPM)High Confidence - USGS Monitoring
System Details
- Water source
- surface water
- Population served
- 12,236
- Service connections
- 5,438
- Status
- Active
Hardness Evidence
- Reported hardness
- 98 PPM
- Grains per gallon
- 5.7 GPG
- Data source
- USGS monitoring
- Source year
- N/A
Linked City Reports
Served ZIP Codes
| ZIP | Location | ZIP average |
|---|---|---|
| 37650 | Erwin, TN | Slightly Hard (98 PPM) |
| 37657 | Flag Pond, TN | Slightly Hard (98 PPM) |
| 37692 | Unicoi, TN | Slightly Hard (72 PPM) |
How to Use This System Page
A public water system can serve multiple ZIP codes and cities. Use this page to inspect the source behind the hardness reading, then open the linked ZIP or city page for the local rollup.
If you are sizing treatment equipment, confirm your actual tap hardness with a home test or lab test before buying.