- EPA's UCMR 5 testing looked for 30 contaminants here and found 1.
- Lithium: found in 4 of 4 samples, average 43.9 µg/L, highest 47.7 µg/L (EPA UCMR 5 testing, Nov 2024–May 2025)
- Lead: 9 in 10 homes tested came in at or below 0 ppb, at or below EPA's 15 ppb action level (latest EPA result for a testing period that ran on or after July 1, 2021: Jan 1, 2026–Jun 30, 2026). This is one number for the whole water system, from homes the utility tested. It isn't a result for your home.
Public EPA test results
Can you drink Twin Falls tap water? What EPA records show
EPA system ID ID5420058 · serves Twin Falls County, ID · about 56,121 people (EPA records)
Here's what EPA has on file for this water system: its testing for newer contaminants like PFAS (UCMR 5), lead testing and violations. It's not a test of your tap, and there's no Water Score here.
Public EPA test results
Twin Falls City of (EPA ID5420058)
EPA data as of October 14, 2026. For Twin Falls's main utility, Twin Falls City of: We found no health-standard violations in EPA's records for this system (ID5420058) since July 1, 2021, as of October 14, 2026. PFOA and PFOS were not detected at or above EPA's reporting level in EPA's UCMR 5 testing.
What EPA records show for Twin Falls City of, as of October 14, 2026
We found no health-standard violations in EPA's records for this system (ID5420058) since July 1, 2021, as of October 14, 2026.
Source: EPA ECHO record for Twin Falls City of (SDWIS). Data as of October 14, 2026.
Lead: 9 in 10 homes tested came in at or below 0 ppb, at or below EPA's 15 ppb action level (latest EPA result for a testing period that ran on or after July 1, 2021: Jan 1, 2026–Jun 30, 2026). This is one number for the whole water system, from homes the utility tested. It isn't a result for your home.
EPA's UCMR 5 testing looked for 30 contaminants here and found 1.
PFOA and PFOS were not detected at or above EPA's reporting level in EPA's UCMR 5 testing.
Source: EPA records (SDWIS, UCMR 5). SDWIS: data as of Oct 14, 2026. EPA UCMR 5 data, samples through June 2026.
Your water bill names your utility.
Does Twin Falls City of use chloramine?
We didn't find chloramine in Twin Falls City of's EPA treatment records. That's not a complete list; your utility's annual water quality report says which disinfectant it uses.