- EPA's UCMR 5 testing looked for 30 contaminants here and found 6.
- Lithium: found in 26 of 26 samples, average 20.7 µg/L, highest 27.6 µg/L (EPA UCMR 5 testing, Apr 2024–Jul 2025)
- PFPeA (a PFAS): found in 8 of 26 samples, average 3.2 ppt, highest 14 ppt (EPA UCMR 5 testing, Apr 2024–Jul 2025)
- PFHxA (a PFAS): found in 8 of 26 samples, average 2.6 ppt, highest 11.9 ppt (EPA UCMR 5 testing, Apr 2024–Jul 2025)
- PFBA (a PFAS): found in 5 of 26 samples, average 1.5 ppt, highest 8.6 ppt (EPA UCMR 5 testing, Apr 2024–Jul 2025)
- PFBS (a PFAS): found in 5 of 26 samples, average 0.80 ppt, highest 4.6 ppt (EPA UCMR 5 testing, Apr 2024–Jul 2025)
- PFOA (a PFAS): found in 2 of 26 samples, average 0.40 ppt, highest 4.8 ppt (EPA UCMR 5 testing, Apr 2024–Jul 2025)
- Lead: 9 in 10 homes tested came in at or below 2.6 ppb, at or below EPA's 15 ppb action level (latest EPA result for a testing period that ran on or after July 1, 2021: Jan 1, 2026–Jun 30, 2026). This is one number for the whole water system, from homes the utility tested. It isn't a result for your home.
Public EPA test results
Can you drink Parker tap water? What EPA records show
EPA system ID CO0118040 · serves Douglas County, CO · about 75,949 people (EPA records)
Here's what EPA has on file for this water system: its testing for newer contaminants like PFAS (UCMR 5), lead testing and violations. It's not a test of your tap, and there's no Water Score here.
Public EPA test results
Parker WSD (EPA CO0118040)
ScoreYourWater.com gives no verdict on your tap water; it shows what the public records say, as of October 14, 2026. For Parker's main utility, Parker WSD: We found no health-standard violations in EPA's records for this system (CO0118040) since July 1, 2021, as of October 14, 2026. EPA's UCMR 5 testing looked for 30 contaminants here and found 6.
What EPA records show for Parker WSD, as of October 14, 2026
We found no health-standard violations in EPA's records for this system (CO0118040) since July 1, 2021, as of October 14, 2026.
Source: EPA ECHO record for Parker WSD (SDWIS). Data as of October 14, 2026.
Lead: 9 in 10 homes tested came in at or below 2.6 ppb, at or below EPA's 15 ppb action level (latest EPA result for a testing period that ran on or after July 1, 2021: Jan 1, 2026–Jun 30, 2026). This is one number for the whole water system, from homes the utility tested. It isn't a result for your home.
EPA's UCMR 5 testing looked for 30 contaminants here and found 6.
Source: EPA records (SDWIS, UCMR 5). SDWIS: data as of Oct 14, 2026. EPA UCMR 5 data, samples through June 2026.
Your water bill names your utility.
Does Parker WSD use chloramine?
EPA treatment records (state-reported) list chloramines for Parker WSD. EPA record