Napa County, California — public water systems

186 active public water systems serve Napa County, reporting 161.9K people served.

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

Active systems

186

Population served

161.9K

Community systems

Groundwater share

89.2%

Water systems in Napa County

Active public water systems in Napa County, California
#	Water system	County	Population served	Type	Source
1	Napa, City of	Napa	84,804	Community	Surface water
2	American Canyon, City of	Napa	21,437	Community	Surface water
3	Phelps Vineyards	Napa	19,412	Non-transient non-community	Groundwater
4	Calistoga, City of	Napa	5,610	Community	Surface water
5	St. Helena, City of	Napa	5,386	Community	Surface water
6	Town of Yountville	Napa	2,787	Community	Purchased surface water
7	Pacific Union College	Napa	1,958	Community	Groundwater
8	Howell Mountain Mutual Water Company	Napa	1,240	Community	Surface water
9	Veterans Home of California	Napa	1,000	Community	Surface water
10	Castello Di Amorosa	Napa	833	Non-transient non-community	Groundwater
11	Adventist Health - St. Helena Hospital	Napa	817	Community	Groundwater
12	Berryessa Highlands	Napa	715	Community	Surface water
13	Domaine Carneros	Napa	652	Non-transient non-community	Groundwater
14	Csp-Bothe-Napa Valley State Park	Napa	565	Transient non-community	Groundwater
15	Circle Oaks Water District	Napa	500	Community	Surface water
16	Raymond Vineyard & Cellar	Napa	490	Non-transient non-community	Groundwater
17	Berryessa Estates (Lbrid)	Napa	474	Community	Surface water
18	Sutter Home Winery	Napa	417	Non-transient non-community	Purchased surface water
19	Napa Valley Country Club	Napa	400	Non-transient non-community	Groundwater
20	Hillside Christian Center Water System	Napa	311	Transient non-community	Groundwater
21	Beringer Vineyards	Napa	300	Non-transient non-community	Groundwater
22	Berryessa Pines Water System	Napa	261	Community	Surface water
23	Hess Winery	Napa	250	Community	Groundwater
24	Meyers Water Co.	Napa	250	Community	Groundwater
25	Bella Union Winery	Napa	238	Non-transient non-community	Groundwater
26	Rutherford Hill Mutual Water	Napa	232	Non-transient non-community	Groundwater
27	Spanish Flat Water District	Napa	230	Community	Surface water
28	Capell Valley Estates	Napa	208	Community	Surface water
29	Enchanted Hills	Napa	206	Transient non-community	Surface water
30	Bell Wine Cellars	Napa	200	Transient non-community	Groundwater
31	Domaine Chandon	Napa	200	Non-transient non-community	Groundwater
32	The Ranch Winery	Napa	200	Non-transient non-community	Groundwater
33	Tpwc Dba the Prisoner Wine Company	Napa	200	Non-transient non-community	Groundwater
34	Putah Canyon Campground	Napa	200	Transient non-community	Groundwater
35	Tucker Acres Mutual Water Co.	Napa	200	Community	Groundwater
36	Welcome Grange Hall	Napa	200	Transient non-community	Groundwater
37	Silver Oak Wine Cellars	Napa	188	Non-transient non-community	Groundwater
38	Csp - Bale Grist Mill State Historic Par	Napa	185	Transient non-community	Groundwater
39	Schramsberg Winery	Napa	161	Non-transient non-community	Groundwater
40	Rombauer Vineyards	Napa	150	Non-transient non-community	Groundwater
41	Skyline Park	Napa	150	Transient non-community	Groundwater
42	Nickel & Nickel Winery	Napa	148	Non-transient non-community	Groundwater
43	Syar Industries	Napa	130	Non-transient non-community	Groundwater
44	Milat Winery	Napa	128	Transient non-community	Groundwater
45	Chateau Montelena Winery	Napa	125	Non-transient non-community	Groundwater
46	Chimney Rock Winery	Napa	122	Transient non-community	Groundwater
47	Lewis Cellars	Napa	119	Transient non-community	Groundwater
48	Baldacci Family Vineyards	Napa	110	Transient non-community	Groundwater
49	One Hope Winery	Napa	110	Transient non-community	Groundwater
50	Rutherford Hill Winery	Napa	110	Non-transient non-community	Groundwater