Is Roswell, GA tap water safe?
Data: U.S. EPA · How we read the data · How we check it
Summary
No federal limits exceeded in EPA data for Cobb County Water System. 3 PFAS were detected below the limits.
4 public water systems serve parts of Roswell. The largest, Cobb County Water System, serves 695,000 people. Your water bill names your system.
Largest system
Cobb County Water System
695,000 people · Purchased surface water · EPA ID GA0670003
Buys treated water from Cobb County – Marietta Water Authority.
| PFAS | Highest average | Limit |
|---|---|---|
| PFOA Not detected | – | 4 ppt |
| PFOS Not detected | – | 4 ppt |
| PFHxS Not detected | – | 10 ppt |
| PFNA Not detected | – | 10 ppt |
| HFPO-DA (GenX) Not detected | – | 10 ppt |
ppt = parts per trillion. "Highest average" is the highest average at any of the system's entry points, the way EPA compares results with the limits.
Lead: 2.6 ppb at the 90th percentile (Dec 2003, and 9 in 10 homes sampled were at or below it) No results since 2003
Health-based violations since 2016: 0
Across Georgia, 27 of 252 water systems EPA tested had PFAS above a 2024 federal limit, and 16 systems were above the lead action level in results from the last five years. Georgia results.
Roswell homes and lead pipes
Lead service lines and lead solder were allowed until 1986, so homes from before then are the ones to check. How to check your own line.
Housing: Census American Community Survey 2020–2024 5-year estimates for Roswell city (tables B25034, B25003). Estimates for small places have a margin of error.
Which system serves your ZIP code
Based on the ZIP codes each system reported serving. Boundaries don't follow ZIP lines exactly, so your water bill is the final word.
| System | ZIP codes in Roswell |
|---|---|
| Cobb County Water System 695,000 people | 30075 |
| North Fulton County Water System 434,517 people | 30076 |
Other water systems serving Roswell
- North Fulton County Water System434,517 people · Purchased surface water · Georgia · reported ZIPs hereNo PFAS above limits
- Roswell14,300 people · Surface water · Georgia · lists this cityNo PFAS above limits
- Mountain Park Water System557 people · Purchased surface water · Georgia · lists this cityNot in EPA's PFAS sample
How nearby cities compare
| City | PFAS | Lead (90th pct.) |
|---|---|---|
| Alpharetta 5 mi North Fulton County Water System | None above limits | 1.6 ppb |
| Dunwoody 7 mi DeKalb County Water System | None above limits | 5.5 ppb |
| Milton 8 mi North Fulton County Water System | None above limits | 1.6 ppb |
| Johns Creek 8 mi North Fulton County Water System | None above limits | 1.6 ppb |
| Woodstock 10 mi Cobb County Water System | None above limits | – |
| Chamblee 11 mi DeKalb County Water System | None above limits | 5.5 ppb |
Questions
Is Roswell tap water safe to drink?
Cobb County Water System has had no health-based violations since 2016. Utility data can't show lead from your own pipes: if your home was built before 1986, test your tap. Your utility's annual Consumer Confidence Report is the official summary.
Who supplies water in Roswell, GA?
4 public water systems serve parts of Roswell. The largest is Cobb County Water System (695,000 people). Your water bill names your system. The EPA ID is also on your utility's Consumer Confidence Report.
Does Roswell tap water have PFAS?
Cobb County Water System had 3 PFAS detected at least once in EPA's 2023–2025 testing, all with averages below the federal limits.
Do Roswell homes have lead pipes?
Census estimates put 22% of Roswell homes as built before 1980 (Georgia: 32%). Lead service lines and lead solder were allowed until 1986, so older homes are more likely to have them. Cobb County Water System's service line inventory says what your line is made of. The only way to know for your home is to check the line where it enters the house and test your tap.
Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.