Drinking water quality · 2023
· Verified
· PWSID CO0103721
What's in Centennial, CO tap water
2 contaminants in Centennial, CO's water sat at or above a federal limit, led by Chlorine Total at 25.0x the limit.
- !2 contaminants at or above a federal limit — worst is Chlorine Total at 25.0x
- !16 of 27 core regulated contaminants reported — 11 never appear in this report
- ✓No open federal violations
+How this score is calculated
Every system starts at 100. Points come off for measured levels, for the federal violation record, and for how much of the core regulated set the utility actually reported. All three inputs are the utility's own published numbers and EPA's own records.
- −48 contaminants at or above a federal limit
- −0 contaminants within 20% of a limit
- −0 open health-based violations
- −0 open monitoring / reporting violations
- −0 health-based violations resolved in the last 5 years
- −5 core regulated contaminants never reported (16/27)
A 90–100 · B 80–89 · C 70–79 · D 60–69 · F below 60. A system reporting under a third of the core set is capped at C however clean its numbers look — a short report is not a clean bill of health.
Full grading methodology, constant for constant →What to worry about
- Chlorine Total25.0× the federal limit1.71–100 mg/L · limit 4 mg/L
higher than 95% of U.S. systems
- PFOA1.0× the federal limit4.09 ng/L · limit 4 ng/L
Linked to cancer, liver damage, and immune effects; the EPA set an enforceable limit of 4 parts per trillion.
higher than 40% of U.S. systems
+29 contaminants were measured and came in below the limitShow all
| Contaminant | Measured | Federal limit |
|---|---|---|
| PFOS | 3.02 ng/L | 4 ng/L |
| TTHM | 38.5 ug/L | 80 ug/L |
| Chlorite | 0.47 mg/L | 1 mg/L |
| Combined Radium | 1.85 pCi/L | 5 pCi/L |
| HAA5 | 21.9 ug/L | 60 ug/L |
| Lead | 3.9 ug/L | 15 ug/L |
| Gross Alpha | 3.63 pCi/L | 15 pCi/L |
| Turbidity | 0.203 NTU | 1 NTU |
| Perfluorohexanesulfonic acid | 1.72 ng/L | 10 ng/L |
| Fluoride | 618 ug/L | 4000 ug/L |
| Arsenic | 1.3 ug/L | 10 ug/L |
| Selenium | 4.33 ug/L | 50 ug/L |
| Uranium | 2.39 ug/L | 30 ug/L |
| Copper | 60 ug/L | 1300 ug/L |
| Barium | 41.3 ug/L | 2000 ug/L |
| Nitrate | 91 ug/L | 10000 ug/L |
| Chromium | 0.91 ug/L | 100 ug/L |
| Chlorine | 34 ug/L | 4000 ug/L |
| Chloramine | 0 mg/L | 4 mg/L |
| Lithium | 9.23 ug/L | — |
| Nickel | 0.94 ug/L | — |
| Sodium | 24000 ug/L | — |
| Total Coliform | 2 % | 0 % |
| Perfluorobutanesulfonic acid | 4.64 ng/L | — |
| Perfluorohexanoic acid | 0.56 ng/L | — |
| Perfluoropentanoic acid | 0.72 ng/L | — |
| PFBA | 0.78 ng/L | — |
| TOC | 2.31 | 1 |
| Gross Beta Particle Activity | 5.6 pCi/L | — |
What this report doesn't tell you
11 of the 27 contaminants a community water system normally reports do not appear anywhere in Centennial, CO's data. Absent is not the same as absent-from-the-water — it means nobody published a number.
+Full detail: PFAS testing, water source, historical monitoring, and the federal violation record
Where your water comes from · EPA SDWIS
Centennial, CO buys its drinking water from DENVER WATER BOARD.
Source
Treatment
Distribution
Also buys water from DENVER WATER BOARD.
Compliance history
Federal Safe Drinking Water Act violation & enforcement records (EPA SDWIS). A violation is a regulatory determination by the state or EPA — separate from the measured levels above.