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Centennial, CO Tap Water Quality 2026

Water quality report for Centennial, CO — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

A look at Centennial's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.

Main Utility: East Cherry Creek Valley Wsd PWSID: CO0103035 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead was not detected and no violations are open. No PFAS was detected.

A

Centennial earns an A for water quality

Graded on violations, lead, and PFAS, with state inspection findings.

Lead: not detected
PFAS tested, none detected
35 violations since 2015, 0 health-based
No violations currently open
Centennial's lead level vs. all Colorado community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: Not detected — 0% of the federal action level
✓ Lower lead than % of Colorado utilities
Population Served
28723
~19300 connections
Water Source
Surface water
Purchased from another system — SDWIS source code SWP
Active Violations
0
35 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
0% of EPA action level
Not detected
Action level: 15 ppb
Lead was not detected at the 90th percentile — the result fell below the laboratory detection limit. That is not the same as an absence of lead in every tap, and older homes with lead service lines can still show higher readings.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
Gross Alpha, Excl. Radon and U MONITORING AND REPORTING — 15 pCi/L 2024 Resolved
Combined Radium (-226 and -228) MONITORING AND REPORTING — 5 pCi/L 2024 Resolved
Gross Alpha, Excl. Radon and U MONITORING AND REPORTING — 15 pCi/L 2024 Resolved
Combined Radium (-226 and -228) MONITORING AND REPORTING — 5 pCi/L 2024 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2019 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2019 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2019 Resolved
Endrin MONITORING AND REPORTING — 0.002 mg/L 2017–2019 Resolved
BHC-GAMMA MONITORING AND REPORTING — 0.0002 mg/L 2017–2019 Resolved
Methoxychlor MONITORING AND REPORTING — 0.04 mg/L 2017–2019 Resolved
Toxaphene MONITORING AND REPORTING — 0.003 mg/L 2017–2019 Resolved
Dalapon MONITORING AND REPORTING — 0.2 mg/L 2017–2019 Resolved
Diquat MONITORING AND REPORTING — 0.02 mg/L 2017–2019 Resolved
Endothall MONITORING AND REPORTING — 0.1 mg/L 2017–2019 Resolved
Di(2-ethylhexyl) adipate MONITORING AND REPORTING — 0.4 mg/L 2017–2019 Resolved
OXAMYL MONITORING AND REPORTING — 0.2 mg/L 2017–2019 Resolved
Simazine MONITORING AND REPORTING — 0.004 mg/L 2017–2019 Resolved
Di(2-ethylhexyl) phthalate MONITORING AND REPORTING — 0.006 mg/L 2017–2019 Resolved
Picloram MONITORING AND REPORTING — 0.5 mg/L 2017–2019 Resolved
Dinoseb MONITORING AND REPORTING — 0.007 mg/L 2017–2019 Resolved
Hexachlorocyclopentadiene MONITORING AND REPORTING — 0.05 mg/L 2017–2019 Resolved
Carbofuran MONITORING AND REPORTING — 0.04 mg/L 2017–2019 Resolved
Atrazine MONITORING AND REPORTING — 0.003 mg/L 2017–2019 Resolved
LASSO MONITORING AND REPORTING — — 2017–2019 Resolved
Heptachlor MONITORING AND REPORTING — 0.0004 mg/L 2017–2019 Resolved
Heptachlor epoxide MONITORING AND REPORTING — 0.0002 mg/L 2017–2019 Resolved
2,4-D MONITORING AND REPORTING — 0.07 mg/L 2017–2019 Resolved
2,4,5-TP MONITORING AND REPORTING — 0.05 mg/L 2017–2019 Resolved
HEXACHLOROBENZENE MONITORING AND REPORTING — 0.001 mg/L 2017–2019 Resolved
Benzo(a)pyrene MONITORING AND REPORTING — 0.0002 mg/L 2017–2019 Resolved
Pentachlorophenol MONITORING AND REPORTING — 0.001 mg/L 2017–2019 Resolved
Total Polychlorinated Biphenyls (PCB) MONITORING AND REPORTING — 0.0005 mg/L 2017–2019 Resolved
1,2-DIBROMO-3-CHLOROPROPANE MONITORING AND REPORTING — 0.0002 mg/L 2017–2019 Resolved
ETHYLENE DIBROMIDE MONITORING AND REPORTING — 0.00005 mg/L 2017–2019 Resolved
Chlordane MONITORING AND REPORTING — 0.002 mg/L 2017–2019 Resolved
Understanding violation types MCL violations mean a contaminant exceeded the federal maximum limit — the most serious type.
TT (Treatment Technique) violations mean required treatment procedures weren't followed, but don't necessarily mean contamination occurred.

Violation History

35 violations are on record since 2015, of which 0 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility East Cherry Creek Valley Wsd
PWSID CO0103035
Water source Surface water — Purchased from another system — SDWIS source code SWP
Population served 28,723
Service connections 19,300
Systems serving this area 10
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Centennial tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open.
Does Centennial water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to Centennial? ▼
East Cherry Creek Valley Wsd (PWSID CO0103035), one of 10 systems serving this area. Surface water. Purchased from another system — SDWIS source code SWP
When was this system last inspected? ▼
It was last inspected on 2023-09-21. Inspectors recorded 2 significant deficiencies.

What Should Centennial Residents Do?

1
Read your annual water report
Your supplier publishes a Consumer Confidence Report each July covering the prior year.
2
Check for a lead service line
Lead reaches tap water mainly through service lines and household plumbing. Suppliers now publish an inventory identifying lead lines.
3
Flush before drinking
If water has sat in pipes more than six hours, run the cold tap for two minutes before drinking or cooking.

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