Drinking water quality · 2023
· Verified
· PWSID CO0116001
What's in Denver, CO tap water
Every one of the 12 core regulated contaminants reported for Denver, CO came in below its federal limit.
- !12 of 27 core regulated contaminants reported — 15 never appear in this report
- ✓Nothing over a federal limit
- ✓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.
- −0 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
- −11 core regulated contaminants never reported (12/27)
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 →+16 contaminants were measured and came in below the limitShow all
| Contaminant | Measured | Federal limit |
|---|---|---|
| TTHM | 38.5 ug/L | 80 ug/L |
| HAA5 | 21.9 ug/L | 60 ug/L |
| Lead | 0.0039 mg/L | 0.015 mg/L |
| Gross Alpha | 3.4 pCi/L | 15 pCi/L |
| Combined Radium | 1.1 pCi/L | 5 pCi/L |
| Turbidity | 0.203 NTU | 1 NTU |
| Fluoride | 618 ug/L | 4000 ug/L |
| Chlorine Total | 0.2 mg/L | 4 mg/L |
| Copper | 60 ug/L | 1300 ug/L |
| Barium | 41.3 ug/L | 2000 ug/L |
| Uranium | 0.5 ug/L | 30 ug/L |
| Nitrate | 91 ug/L | 10000 ug/L |
| Lithium | 9.23 ug/L | — |
| Nickel | 0.94 ug/L | — |
| Sodium | 24000 ug/L | — |
| Total Coliform | 2 % | 0 % |
What this report doesn't tell you
15 of the 27 contaminants a community water system normally reports do not appear anywhere in Denver, 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
Denver, CO's drinking water comes from surface water, drawn from 4 sources.
Source
- MARSTON FOREBAY
- RALSTON RESERVOIR INTAKE
- S PLATTE DIVERSION CONDUIT
- STRONTIA SPRINGS RES INTAKE
Treatment
- FOOTHILLS WTP
- MARSTON WTP
- MOFFAT WTP
- + 2 more
Distribution
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.