EPA system ID CO0118020 · serves Douglas County, CO · about 10,867 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
Cottonwood WSD (EPA CO0118020)
What EPA records show for Cottonwood WSD, as of October 14, 2026
We found no health-standard violations in EPA's records for this system (CO0118020) since July 1, 2021, as of October 14, 2026.
Lead: 9 in 10 homes tested came in at or below 0 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 Cottonwood WSD use chloramine?
We didn't find chloramine in Cottonwood WSD's EPA treatment records. That's not a complete list; your utility's annual water quality report says which disinfectant it uses.
Reported results in EPA records (data as of Oct 14–15, 2026)
EPA's UCMR 5 testing looked for 30 contaminants here and found 6.
Lithium: found in 6 of 6 samples, average 20.4 µg/L, highest 29.3 µg/L (EPA UCMR 5 testing, Mar 2023–Jan 2024)
PFPeA (a PFAS): found in 3 of 6 samples, average 2.7 ppt, highest 6.2 ppt (EPA UCMR 5 testing, Mar 2023–Jan 2024)
PFHxA (a PFAS): found in 3 of 6 samples, average 2.2 ppt, highest 5.4 ppt (EPA UCMR 5 testing, Mar 2023–Jan 2024)
PFBS (a PFAS): found in 2 of 6 samples, average 1.5 ppt, highest 4.7 ppt (EPA UCMR 5 testing, Mar 2023–Jan 2024)
PFBA (a PFAS): found in 1 of 6 samples, average 0.90 ppt, highest 5.6 ppt (EPA UCMR 5 testing, Mar 2023–Jan 2024)
PFOA (a PFAS): found in 1 of 6 samples, average 0.70 ppt, highest 4 ppt (EPA UCMR 5 testing, Mar 2023–Jan 2024)
Lead: 9 in 10 homes tested came in at or below 0 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.
Source: EPA SDWIS (ECHO SDWA bulk download), data as of Oct 14, 2026
Source: EPA UCMR 5 occurrence data, data as of Oct 15, 2026
These are EPA's public records for this water system, shown as of October 14, 2026. If you represent this utility, or think a record here is wrong, tell us: Report an error. If the error is in EPA's own records, your state drinking water program can correct it there, and this page updates at our next data refresh.
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