Jefferson County, Colorado — public water systems

111 active public water systems serve Jefferson County, reporting 577.4K people served.

Dataset updated July 2026 . Source: EPA SDWIS/ECHO, refreshed quarterly.

Active systems

111

Population served

577.4K

Community systems

Groundwater share

64%

Water systems in Jefferson County

Active public water systems in Jefferson County, Colorado
#	Water system	County	Population served	Type	Source
1	Arvada City of	Jefferson	171,610	Community	Surface water
2	Consolidated Mutual Maple Grove	Jefferson	81,400	Community	Surface water
3	Green Mountain Wsd	Jefferson	49,400	Community	Purchased surface water
4	Bancroft Clover Wsd	Jefferson	44,000	Community	Purchased surface water
5	Golden City of	Jefferson	38,288	Community	Surface water
6	Bear Creek Wsd	Jefferson	30,000	Community	Purchased surface water
7	Wheat Ridge Water District	Jefferson	20,000	Community	Purchased surface water
8	Evergreen Md	Jefferson	15,750	Community	Surface water
9	Lakehurst Wsd	Jefferson	12,000	Community	Purchased surface water
10	Ken Caryl Wsd	Jefferson	12,000	Community	Purchased surface water
11	Valley Wd	Jefferson	10,000	Community	Purchased surface water
12	North Table Mountain Wsd	Jefferson	10,000	Community	Surface water
13	Morrison Town of	Jefferson	9,887	Community	Surface water
14	Willowbrook Wsd	Jefferson	9,348	Community	Purchased surface water
15	Lakewood City of	Jefferson	6,000	Community	Purchased surface water
16	Edgewater City of	Jefferson	5,300	Community	Purchased surface water
17	High View Wd	Jefferson	4,000	Community	Purchased surface water
18	Genesee Wsd	Jefferson	3,920	Community	Surface water
19	Meadowbrook Wd	Jefferson	3,290	Community	Purchased surface water
20	Molson Coors Beverage Company	Jefferson	2,725	Non-transient non-community	Surface water
21	South Sheridan Water and Sewer Dist	Jefferson	2,500	Community	Purchased surface water
22	Alameda Wsd	Jefferson	2,480	Community	Purchased surface water
23	Conifer High School	Jefferson	2,350	Non-transient non-community	Surface water
24	Mountain Wsd	Jefferson	1,941	Community	Groundwater under influence of surface water
25	Aspen Park Md	Jefferson	1,800	Non-transient non-community	Groundwater
26	Ralston Valley Wsd	Jefferson	1,610	Community	Purchased surface water
27	Indian Hills Wd	Jefferson	1,300	Community	Groundwater under influence of surface water
28	Bear Creek Lake Park	Jefferson	1,250	Transient non-community	Surface water
29	Tiny Town Historical Park	Jefferson	1,210	Transient non-community	Groundwater
30	Staunton State Park	Jefferson	1,079	Transient non-community	Groundwater
31	Homestead Wc	Jefferson	1,000	Community	Surface water
32	North Lincoln Wsd	Jefferson	1,000	Community	Purchased surface water
33	Alta Convenience No 6152	Jefferson	1,000	Transient non-community	Groundwater
34	Brook Forest Wd	Jefferson	998	Community	Groundwater
35	Marshdale Elem School	Jefferson	920	Non-transient non-community	Groundwater
36	Golden Terrace West	Jefferson	825	Community	Purchased surface water
37	Friends of Dinosaur Ridge	Jefferson	770	Transient non-community	Groundwater
38	Mt Vernon Country Club	Jefferson	734	Community	Groundwater under influence of surface water
39	Elk Creek Elem School	Jefferson	600	Non-transient non-community	Surface water
40	Golden Terrace Village	Jefferson	580	Community	Purchased surface water
41	Conifer Wa	Jefferson	550	Non-transient non-community	Groundwater
42	Conifer Md	Jefferson	525	Non-transient non-community	Groundwater
43	Geneva Glen Camp	Jefferson	513	Transient non-community	Groundwater
44	Granite Lake	Jefferson	506	Transient non-community	Groundwater
45	Sheridan MHP	Jefferson	480	Community	Groundwater
46	Mountainside Estates MHP	Jefferson	473	Community	Purchased surface water
47	Golden Terrace South	Jefferson	425	Community	Purchased surface water
48	Ramah in the Rockies	Jefferson	405	Transient non-community	Groundwater
49	Forest Hills Md Riva Chase	Jefferson	400	Community	Groundwater
50	Mother Cabrini Shrine	Jefferson	389	Transient non-community	Groundwater