- EPA's UCMR 5 testing didn't include this system. It covered systems serving more than 3,300 people and a sample of smaller ones.
- Lead, 90th percentile: 2.9 ppb at the latest result in EPA records for a monitoring period that ran on or after July 1, 2021, at or below EPA's 15 ppb action level (EPA SDWIS, monitoring period Jan 1, 2024–Dec 31, 2026)
- No health-based violations since July 1, 2021 in EPA records.
Public EPA test results
Cobb Co.-Marietta Water Auth.: what EPA records show
EPA GA0670002 · serves Cobb County, GA · about 0 people (EPA SDWIS)
This report shows EPA's federal records for this water system: UCMR 5 testing, lead testing and violations. It isn't a test of the water at your tap, and it has no Water Score.
Public EPA test results
Cobb Co.-Marietta Water Auth. (EPA GA0670002)
Does Cobb Co.-Marietta Water Auth. use chloramine?
We didn't find chloramine in Cobb Co.-Marietta Water Auth.'s EPA treatment records. That's not a complete list; your utility's annual water quality report says which disinfectant it uses.
What EPA records show for this system
Reported results in EPA records (data as of Oct 14–15, 2026)
Source: EPA SDWIS (ECHO SDWA bulk download), data as of Oct 14, 2026
Source: EPA UCMR 5 occurrence data, data as of Oct 15, 2026
These are EPA's public records for this water system, shown as of October 14, 2026. If you represent this utility, or think a record here is wrong, tell us: Report an error. If the error is in EPA's own records, your state drinking water program can correct it there, and this page updates at our next data refresh.
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