County · Colorado
Jefferson County, Colorado: drinking water records
This overview covers 27 ZIP codes and 46 community water systems in Jefferson County. It also stands in for 4 ZIP codes whose utility has too little EPA data for a page of its own.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems with the most complete records
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| Golden Terrace West CO0130319 | 825 | 120 | 0 | 1 | 0 ppb |
| Arvada City of CO0130001 | 171,610 | 240 | 0 | 0 | 3.1 ppb |
| Consolidated Mutual Maple Grove CO0130020 | 81,400 | 120 | 3 | 0 | 2 ppb |
| Green Mountain WSD CO0130321 | 49,400 | 0 | 0 | 1 | 9 ppb |
| Golden City of CO0130040 | 38,288 | 120 | 0 | 0 | 0 ppb |
| Wheat Ridge Water District CO0130842 | 20,000 | 0 | 0 | 1 | 9 ppb |
| Evergreen Md CO0130030 | 15,750 | 120 | 0 | 0 | 6 ppb |
| North Table Mountain WSD CO0130105 | 10,000 | 120 | 0 | 0 | 1.3 ppb |
| Morrison Town of CO0130085 | 9,887 | 120 | 2 | 0 | 2.7 ppb |
| Genesee WSD CO0130035 | 3,920 | 120 | 0 | 0 | 2 ppb |
| South Sheridan Water and Sewer Dist CO0130718 | 2,500 | 0 | 0 | 1 | 9 ppb |
| Mountain WSD CO0130100 | 1,941 | 0 | 0 | 3 | 4 ppb |
| Indian Hills WD CO0130065 | 1,300 | 0 | 0 | 6 | 1 ppb |
| Homestead Wc CO0130050 | 1,000 | 0 | 0 | 17 | 1 ppb |
| North Lincoln WSD CO0116552 | 1,000 | 0 | 0 | 1 | 9 ppb |
| Mt Vernon Country Club CO0130090 | 734 | 0 | 0 | 7 | 3 ppb |
| Golden Terrace Village CO0130317 | 580 | 0 | 0 | 1 | 0 ppb |
| Mountainside Estates MHP CO0130517 | 473 | 0 | 0 | 1 | 0 ppb |
| Golden Terrace South CO0130318 | 425 | 0 | 0 | 1 | 0 ppb |
| Idledale WSD CO0130055 | 350 | 0 | 0 | 1 | 0 ppb |
| Hidden Valley Water District CO0130045 | 155 | 0 | 0 | 3 | 3.5 ppb |
| Buffalo Creek WD CO0130015 | 125 | 0 | 0 | 3 | 3 ppb |
| Cragmont Wc CO0130187 | 50 | 0 | 0 | 4 | 0.5 ppb |
| Bancroft Clover WSD CO0130133 | 44,000 | 0 | 0 | 0 | 9 ppb |
| Bear Creek WSD CO0130138 | 30,000 | 0 | 0 | 0 | 9 ppb |
ZIP reports in Jefferson County
No ZIP report in this county is published yet.
These ZIP codes are covered by this overview because their utility has too little EPA data for a separate page: 80128, 80226, 80227, 80232.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Page generated 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.