Tap Water Results

Is Centennial, CO 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 Parker Water & Sanitation District. 5 PFAS were detected below the limits.

6 public water systems serve parts of Centennial. The largest, Parker Water & Sanitation District, serves 75,949 people. Your water bill names your system.

Largest system

Parker Water & Sanitation District

75,949 people · Surface water · EPA ID CO0118040

Buys treated water from Wise Project Water System.

PFASHighest averageLimitStatus
PFOA
One sample above limit
1.2 ppt4 pptOne sample above limit
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 (Jun 2026, and 9 in 10 homes sampled were at or below it) Below action level
Health-based violations since 2016: 0

Full Parker Water & Sanitation District results

Across Colorado, 4 of 158 water systems EPA tested had PFAS above a 2024 federal limit, and 2 systems were above the lead action level in results from the last five years. Colorado results.

Centennial homes and lead pipes

43%
of homes built before 1980 (Colorado 40%, US 50%)
1%
built before 1950 (Colorado 9%)
19%
of households rent (Colorado 34%)

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 Centennial 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.

SystemZIP codes in Centennial
Parker Water & Sanitation District
75,949 people
80112
East Cherry Creek Valley Water & Sanitation District
66,130 people
80015

Other water systems serving Centennial

How nearby cities compare

CityMain water systemPFASLead (90th pct.)
Englewood 8 mi
City of Englewood
City of EnglewoodNone above limits5 ppb
Littleton 8 mi
Denver Water Board
Denver Water BoardNone above limits3.6 ppb
Parker 8 mi
Parker Water & Sanitation District
Parker Water & Sanitation DistrictNone above limits2.6 ppb
Aurora 11 mi
City of Aurora
City of AuroraNone above limits4.7 ppb
Denver 12 mi
Denver Water Board
Denver Water BoardNone above limits3.6 ppb
Castle Rock 15 mi
Town of Castle Rock
Town of Castle RockNone above limits2 ppb

Questions

Is Centennial tap water safe to drink?

Parker Water & Sanitation District 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 Centennial, CO?

6 public water systems serve parts of Centennial. The largest is Parker Water & Sanitation District (75,949 people). Your water bill names your system. The EPA ID is also on your utility's Consumer Confidence Report.

Does Centennial tap water have PFAS?

Parker Water & Sanitation District had 5 PFAS detected at least once in EPA's 2023–2025 testing, all with averages below the federal limits.

Do Centennial homes have lead pipes?

Census estimates put 43% of Centennial homes as built before 1980 (Colorado: 40%). Lead service lines and lead solder were allowed until 1986, so older homes are more likely to have them. Parker Water & Sanitation District'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.