Tap Water Results

Is Littleton, 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 Denver Water Board.

2 public water systems serve parts of Littleton. The largest, Denver Water Board, serves 1.3 million people. Your water bill names your system.

Largest system

Denver Water Board

1.3 million people · Surface water · EPA ID CO0116001

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: 3.6 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 Denver Water Board 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.

Littleton homes and lead pipes

46%
of homes built before 1980 (Colorado 40%, US 50%)
6%
built before 1950 (Colorado 9%)
39%
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. Denver Water Board's service line inventory lists 9,939 lead lines (as of 2026-11-10). Look up your address. 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 Littleton city (tables B25034, B25003). Estimates for small places have a margin of error.

Other water systems serving Littleton

  • Dominion Water & Sanitation District
    Wholesale supplier (sells water to other systems) · Purchased surface water · Colorado · lists this city
    Not in EPA's PFAS sample

How nearby cities compare

CityMain water systemPFASLead (90th pct.)
Englewood 4 mi
City of Englewood
City of EnglewoodNone above limits5 ppb
Centennial 8 mi
Parker Water & Sanitation District
Parker Water & Sanitation DistrictNone above limits2.6 ppb
Lakewood 9 mi
Consolidated Mutual Maple Grove Water System
Consolidated Mutual Maple Grove Water SystemNone above limits3.7 ppb
Wheat Ridge 13 mi
Wheat Ridge Water District
Wheat Ridge Water DistrictNot tested–
Parker 14 mi
Parker Water & Sanitation District
Parker Water & Sanitation DistrictNone above limits2.6 ppb
Denver 14 mi
Denver Water Board
Denver Water BoardNone above limits3.6 ppb
Littleton ZIP codes (1)
  • 80120

Questions

Is Littleton tap water safe to drink?

Denver Water Board 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 Littleton, CO?

2 public water systems serve parts of Littleton. The largest is Denver Water Board (1.3 million people). Your water bill names your system. The EPA ID is also on your utility's Consumer Confidence Report.

Does Littleton tap water have PFAS?

None detected above EPA's reporting limits. Denver Water Board had no PFAS detected in EPA's 2023–2025 testing. "Not detected" means below the reporting limit (about 2 to 20 ppt), not proven zero.

Do Littleton homes have lead pipes?

Census estimates put 46% of Littleton 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. Denver Water Board's service line inventory lists 9,939 lead lines. 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.