Water Quality in San Jose, CA (95023)
EPA violation data for public water systems serving ZIP code 95023.
Active Health Violations
5 health-based violations found in the past 5 years, with at least one still unresolved. Contaminant levels have exceeded federal safety limits. Consider testing your tap water independently.
More violations than 92% of US ZIP codes.
Based on EPA compliance data. Not a substitute for an official water quality report from your utility.
59,889
Population
105
Water Systems
59
Violations (5yr)
5
Health-Based
Location
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Water Systems Serving This Area (105)
San Jose Water
1 health-based Surface water 1,039,920 people served
1 violation (5yr)
· 1 health-based · All resolved
Lead tested: 0 ppb (limit: 15 ppb) ✓
City Of Sunnyvale
Purchased surface water 157,566 people served
0 violations
City Of Santa Clara
Purchased surface water 130,746 people served
0 violations
Great Oaks Wc Inc
Groundwater 110,088 people served
0 violations
City Of San Jose - Evg/Edv/Coy
Purchased surface water 101,265 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓
City Of Milpitas
All resolved Purchased surface water 81,773 people served
2 violations (5yr)
· All resolved
City Of Mountain View
Purchased surface water 81,501 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓
Cwsc Los Altos Suburban
Purchased surface water 69,973 people served
0 violations
Lead tested: 1.5 ppb (limit: 15 ppb) ✓
City Of Palo Alto
Purchased surface water 67,231 people served
0 violations
Hollister, City Of
1 health-based Purchased surface water 26,017 people served
3 violations (5yr)
· 1 health-based · All resolved
Sunnyslope County Water Dist
Purchased surface water 24,954 people served
0 violations
Nps Lassen Volcanic Np
Surface water 15,000 people served
0 violations
33rd District Agricultural Association
Groundwater 9,000 people served
0 violations
Henry Coe Park Rabbit Spring
Groundwater 7,000 people served
0 violations
San Benito High School
Groundwater 3,310 people served
0 violations
Lead tested: 5.5 ppb (limit: 15 ppb) ✓
Pyramid Creek Trailhead
Groundwater 2,000 people served
0 violations
Csp Hollister Hills Svra
All resolved Groundwater 1,220 people served
3 violations (5yr)
· All resolved
Pacific Scientific Energetic Mats. Comp.
Groundwater 550 people served
0 violations
Lead tested: 5 ppb (limit: 15 ppb) ✓
Kingdom Hall (Fallon Rd)
Groundwater 500 people served
0 violations
Silver Lake Campground
All resolved Groundwater 500 people served
1 violation (5yr)
· All resolved
The Grove
Groundwater 500 people served
0 violations
San Juan Oaks Golf Club
All resolved Groundwater 450 people served
1 violation (5yr)
· All resolved
Mission Oaks Mobile Home Park
Groundwater 450 people served
0 violations
Peninsula Recreation Area
Groundwater 353 people served
0 violations
Teledyne Mc Cormick Selph
Groundwater 300 people served
0 violations
Southside Elementary School
Groundwater 300 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓
Dunneville Market & Kitchen
Groundwater 300 people served
0 violations
Willow Heights Mansion
Groundwater 269 people served
0 violations
Casa De Fruta Water System
1 health-based Groundwater 250 people served
2 violations (5yr)
· 1 health-based
Lead tested: 0 ppb (limit: 15 ppb) ✓
Wench Creek Campground
All resolved Groundwater 250 people served
2 violations (5yr)
· All resolved
Csa No. 31 Stonegate Ws
1 health-based Surface water 230 people served
2 violations (5yr)
· 1 health-based · All resolved
Denice & Filice Llc - Inactive
Groundwater 200 people served
0 violations
Bear River Camp--South Shore
Groundwater 200 people served
3 violations (5yr)
Ice House Campground
Groundwater 200 people served
0 violations
San Justo Mutual Water Company
1 health-based Groundwater 160 people served
3 violations (5yr)
· 1 health-based
Lead tested: 0 ppb (limit: 15 ppb) ✓
Wolf Creek Campground
All resolved Groundwater 150 people served
2 violations (5yr)
· All resolved
Pipi Campground Water System
All resolved Groundwater 150 people served
3 violations (5yr)
· All resolved
Hollister Ranch Estates
All resolved Groundwater 150 people served
1 violation (5yr)
· All resolved
Rosa Morada Mutual Water Company
Groundwater 138 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓
Best Road Mwc
All resolved Groundwater under influence of surface water 133 people served
5 violations (5yr)
· All resolved
Ashford Highlands Mwc
Groundwater 132 people served
0 violations
Valdez Tract Community
Groundwater 132 people served
0 violations
Gerle Creek Campground
Groundwater 125 people served
0 violations
Loon Lake Campground
Groundwater 125 people served
0 violations
Bear River Group Campground
All resolved Groundwater 125 people served
2 violations (5yr)
· All resolved
Hollister Sda Christian School
Groundwater 122 people served
1 violation (5yr)
Dunneville Estates Csa #50
Groundwater 120 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓
Mcmahon Road Mutual Water Company
Groundwater 102 people served
0 violations
Lead tested: 2.9 ppb (limit: 15 ppb) ✓
Stumpy Meadows Campground
Groundwater 100 people served
0 violations
Yellow Jacket Campground
All resolved Groundwater 100 people served
3 violations (5yr)
· All resolved
Comstock Mutual Water Company
Groundwater 100 people served
0 violations
Vineyard Estates Mwc
Groundwater 90 people served
2 violations (5yr)
Bentley Trailer Court
Groundwater 84 people served
0 violations
West Point Campground
Groundwater 75 people served
0 violations
China Flat Campground
Groundwater 75 people served
0 violations
Wrights Lake Campground
Groundwater 75 people served
0 violations
Jesus Quintero Labor Camp
Groundwater 72 people served
0 violations
Silverfork Campground
Groundwater 70 people served
0 violations
Creekbridge Mutual Water Company
Groundwater 69 people served
0 violations
Kirkwood Campground
All resolved Groundwater 65 people served
1 violation (5yr)
· All resolved
Gilmore Water Company
Groundwater 60 people served
0 violations
Casa De Fruta Orchards
All resolved Groundwater 53 people served
1 violation (5yr)
· All resolved
Sand Flat Campground
Groundwater 50 people served
0 violations
Quintero Labor Camp #1 (Wright Rd)
Groundwater 50 people served
0 violations
Springwood Estates Mwc
Groundwater 50 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓
Venture Estates Mwc
Groundwater 50 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓
Cienega Winery
Groundwater 50 people served
0 violations
Southside Elementary School
Groundwater 40 people served
0 violations
Sedlachek Water Co
Unknown 40 people served
0 violations
Thomas Orchard Inc
Groundwater 40 people served
0 violations
Whispering Pines Inn
All resolved Groundwater 38 people served
2 violations (5yr)
· All resolved
Park Marina *Cl 10/29/15
Groundwater 35 people served
0 violations
B & R Farms
Groundwater 34 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓
Nueva Vistaschool
Groundwater 34 people served
0 violations
Benito Valley Farms
All resolved Groundwater 34 people served
12 violations (5yr)
· All resolved
Salinas Labor Camp
Groundwater 30 people served
0 violations
O'Bannon'S Mobile Home Park
Groundwater 30 people served
0 violations
Herbert Ranch Labor Camp
Groundwater 30 people served
0 violations
Foothill Rd Water System
Groundwater 26 people served
0 violations
Casa De Fruta Labor Camp
Groundwater 25 people served
0 violations
Mccloskey Shared Water System
Groundwater 25 people served
0 violations
Capps Crossing Campground
Groundwater 25 people served
0 violations
Vineyard Estates Mutual
Groundwater 25 people served
0 violations
Del Curto Meat Company
Groundwater 25 people served
0 violations
Filice Farms
Groundwater 25 people served
0 violations
Red Fir Group Campground
Groundwater 25 people served
0 violations
Weatherly
Groundwater 25 people served
0 violations
Jefferson School
Groundwater 25 people served
0 violations
San Benito County Water District
Surface water 25 people served
0 violations
Days End Motel And Mhp
Groundwater 25 people served
0 violations
Almaden Vineyards
Groundwater 25 people served
0 violations
Weatherly Water System
Groundwater 25 people served
0 violations
San Benito County Historical Park
All resolved Groundwater 25 people served
1 violation (5yr)
· All resolved
Rancho San Joaquin Mutual
Groundwater 25 people served
0 violations
Thomas Orchards
Groundwater 25 people served
0 violations
Bell Station Inn
Groundwater 25 people served
0 violations
Leo Cortez
Groundwater 25 people served
0 violations
Quintero Labor Camp #2
Unknown 15 people served
0 violations
Riverside Water Company
Groundwater 0
0 violations
El Modeno Nursery Inc.
Groundwater 0
0 violations
Spring Grove Elementary School
Groundwater 0
0 violations
Fairview Child Development Center -
Groundwater 0
0 violations
Fairview Road Water System
Groundwater 0
0 violations
Arroyo Seco Irrigation Association
Groundwater 0
0 violations
Mccloskey Road Llc
Groundwater 0
0 violations
Contaminants Found
LEAD AND COPPER RULE REVISIONSHealth-Based
4 violations
Has active
TTHMHealth-Based
3 violations
All resolved
Surface Water Treatment RuleHealth-Based
1 violation
All resolved
CARBON, TOTALHealth-Based
1 violation
All resolved
Revised Total Coliform RuleMonitoring
Missed testing deadlines — not a detection of bacteria.
27 violations
All resolved
NitrateMonitoring
At high levels, nitrate can cause blue baby syndrome in infants.
8 violations
All resolved
Lead and Copper RuleMonitoring
Lead and copper testing requirement. Lead exposure can cause developmental harm in children.
8 violations
Has active
Total Haloacetic Acids (HAA5)Monitoring
2 violations
All resolved
E. COLIMonitoring
2 violations
Has active
Consumer Confidence RuleMonitoring
Annual water quality report delivery requirement.
2 violations
All resolved
Public NoticeMonitoring
1 violation
All resolved
Lead & Copper Levels
Lead (Pb)
Within limit0 ppb measured
Action level: 15 ppb
Sampled: Jan 2023
How Does This Compare?
San Jose (95023) has more violations than 92% of US ZIP codes. The national average is 18.87 violations per ZIP over 5 years. This ZIP has 59.
Fewer violations 92th percentile More violations
Recommended Water Filters
Based on health-based violations detected in your area, these filter types are commonly used to address similar contaminants. Consult your water utility's Consumer Confidence Report for the most current data.
Reverse Osmosis System
Highly effective at removing heavy metals, dissolved solids, and a wide range of contaminants. Recommended for homes with lead or arsenic concerns.
Targets:Lead, Copper, Arsenic, Mercury, Cadmium
Look for:NSF/ANSI 58 certified
Activated Carbon Filter
Excellent for removing chlorine, chloramine, and disinfection byproducts like THMs and HAAs. Available as pitcher filters, countertop, or under-sink units.
Targets:THMs, HAAs, Chlorine, Chloramine, Taste & Odor
Look for:NSF/ANSI 42 & 53 certified
Always look for filters certified by NSF International for the specific contaminants you want to remove. This is general educational information, not an endorsement of any specific product.