Is Kennesaw, 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.
Cobb County Water System supplies Kennesaw (695,000 people).
Water 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.
Kennesaw homes and lead pipes
Lead service lines and lead solder were allowed until 1986, so homes from before then are the ones to check. Renting? Ask your landlord what the service line is made of, because it's their pipe to replace. How to check your own line.
Housing: Census American Community Survey 2020–2024 5-year estimates for Kennesaw city (tables B25034, B25003). Estimates for small places have a margin of error.
How nearby cities compare
| City | PFAS | Lead (90th pct.) |
|---|---|---|
| Marietta 7 mi Cobb County Water System | None above limits | – |
| Woodstock 8 mi Cobb County Water System | None above limits | – |
| Smyrna 13 mi Cobb County Water System | None above limits | – |
| Cartersville 14 mi Bartow County Water System | None above limits | 1.4 ppb |
| Mableton 15 mi Cobb County Water System | None above limits | – |
| Roswell 15 mi Cobb County Water System | None above limits | – |
Kennesaw ZIP codes (1)
- 30144
Questions
Is Kennesaw 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 Kennesaw, GA?
Cobb County Water System, which serves 695,000 people.
Does Kennesaw 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 Kennesaw homes have lead pipes?
Census estimates put 11% of Kennesaw 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.