City and town drinking water records

Water systems serving Deer Park, CA

4 community water systems have a mapped service area in Deer Park, CA. Howell Mountain Mutual Water Company covers 13% of the area inside Deer Park's Census boundary and reports serving 1,240 people in all.

1 of them had at least one health-based violation in the last 10 years. None of those systems has one still unresolved.

3 rely mainly on groundwater and 1 on surface water, counting water bought from other systems.

Their lead service line inventories list no lead lines, no galvanized lines that must be replaced and no lines of unknown material.

Community water systems

4

Systems with a health-based violation, last 10 years

1

Systems with one unresolved

0

Lead service lines in inventories

0

Water systems serving Deer Park

4 systems

People served is each system's own figure for its whole service area. Violation counts cover the last 10 years of EPA records.

System	Area	People served	Main source	Health-based violations, 10 years	Unresolved	Lead lines
Howell Mountain Mutual Water Company	Covers 13% of Deer Park	1,240	Surface water	4	0	0
Linda Vista Mutual Water Co	Mapped area inside Deer Park	90	Groundwater	0	0	0
Vailima Estates Mutual Water	Mapped area inside Deer Park	25	Groundwater	0	0	0
Adventist Health - St. Helena Hospital	Mapped area inside Deer Park	817	Groundwater	0	0	0

Other cities and towns in Napa County

10 places

• American Canyon
• Angwin
• Calistoga
• Moskowite Corner
• Napa
• Oakville
• Rutherford
• Silverado Resort
• St. Helena
• Yountville

Back to Napa County, CA

Counties come from the counties EPA lists each system serving, matched to 2024 Census counties; where EPA lists none, from the county coded in the system's ID, its service area map, or its mailing address. A county holding at least a fifth of a system's service area map is added when at least a fifth of that map lies in those counties. Towns are the ones EPA lists and the Census places such a map covers, always inside those counties. In New England, where EPA's town names a whole Town, it is not matched to the village of the same name. A system is not listed in a county holding less than a fifth of its map, or in a county or town its map reaches when the map lies mostly outside the counties EPA lists, so a page can leave out a system that serves part of the area. Methodology and limitations