Tap Water Results

Is Woodstock, 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.

3 public water systems serve parts of Woodstock. The largest, Cobb County Water System, serves 695,000 people, and one system here had PFAS above a federal limit. 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.

PFASHighest averageLimitStatus
PFOA
Not detected
–4 pptNot detected
PFOS
Not detected
–4 pptNot detected
PFHxS
Not detected
–10 pptNot detected
PFNA
Not detected
–10 pptNot detected
HFPO-DA (GenX)
Not detected
–10 pptNot detected

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

Full Cobb County Water System results

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.

Woodstock homes and lead pipes

7%
of homes built before 1980 (Georgia 32%, US 50%)
0%
built before 1950 (Georgia 6%)
36%
of households rent (Georgia 34%)

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 Woodstock city (tables B25034, B25003). Estimates for small places have a margin of error.

Other water systems serving Woodstock

How nearby cities compare

CityMain water systemPFASLead (90th pct.)
Kennesaw 8 mi
Cobb County Water System
Cobb County Water SystemNone above limits–
Canton 10 mi
Canton Water System
Canton Water SystemNone above limits0 ppb
Roswell 10 mi
Cobb County Water System
Cobb County Water SystemNone above limits–
Marietta 10 mi
Cobb County Water System
Cobb County Water SystemNone above limits–
Milton 12 mi
North Fulton County Water System
North Fulton County Water SystemNone above limits1.6 ppb
Alpharetta 14 mi
North Fulton County Water System
North Fulton County Water SystemNone above limits1.6 ppb
Woodstock ZIP codes (1)
  • 30188

Questions

Is Woodstock 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 Woodstock, GA?

3 public water systems serve parts of Woodstock. 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 Woodstock 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 Woodstock homes have lead pipes?

Census estimates put 7% of Woodstock 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.