Water Quality in San Jose, CA (95112)
EPA violation data for public water systems serving ZIP code 95112.
Past Health-Based Violations
1 health-based violation was found in the past 5 years, meaning contaminant levels exceeded federal safety limits. All have since been resolved. There are also 6 monitoring/reporting violations.
More violations than 60% of US ZIP codes.
Based on EPA compliance data. Not a substitute for an official water quality report from your utility.
57,373
Population
80
Water Systems
7
Violations (5yr)
1
Health-Based
Location
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Water Systems Serving This Area (80)
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
California Water Service Co. - Ela
Purchased surface water 152,474 people served
0 violations
California Water Service Co. - Dominguez
Purchased surface water 143,996 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) ✓
California Water Service Co. - Herm/Redo
Purchased surface water 96,853 people served
0 violations
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) ✓
California Water Service Co. - Palos Ver
Purchased surface water 71,452 people served
0 violations
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
Hawthorne-City Water Dept.
Purchased surface water 44,718 people served
0 violations
Cws - Selma
Groundwater 26,517 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓
Cws - North Garden
Surface water 22,762 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓
California Water Service Co - Westlake
Purchased surface water 19,533 people served
0 violations
Lead tested: 3 ppb (limit: 15 ppb) ✓
California Water Service Co.-Travis Afb
Purchased surface water 18,111 people served
0 violations
Lead tested: 1.7 ppb (limit: 15 ppb) ✓
Cwsc King City
Groundwater 16,334 people served
0 violations
Cal-Water Service Co.-Marysville
Groundwater 12,419 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓
Cal-Water Service Co.-Oroville
All resolved Surface water 11,106 people served
1 violation (5yr)
· All resolved
Lead tested: 0.9 ppb (limit: 15 ppb) ✓
California Water Service Co. - Dixon
Groundwater 10,623 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓
Cal-Water Service Co.-Willows
Groundwater 7,240 people served
0 violations
Cwsc Salinas Hills
Groundwater 5,293 people served
0 violations
Lead tested: 0.9 ppb (limit: 15 ppb) ✓
Commerce-City, Water Dept.
Purchased surface water 4,205 people served
0 violations
Tesoro Viejo Master Mwc, Inc.
Surface water 3,885 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓
Cwsc Oak Hills
Groundwater 3,161 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓
Cws - Kernville
Surface water 2,572 people served
0 violations
Lead tested: 7.4 ppb (limit: 15 ppb) ✓
Calif State U At San Jose
Groundwater 2,500 people served
0 violations
Lucerne Water Co. - Cal Water Service
Surface water 2,129 people served
0 violations
Cwsc Las Lomas
Groundwater 2,084 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓
Cal-Water Service Co.-Hamilton City
Groundwater 1,799 people served
0 violations
Good Samaritan Health System-San Jose
Groundwater 1,400 people served
0 violations
California Water Service Co.-Lancaster
Purchased surface water 1,387 people served
0 violations
Cws Southlake System
Groundwater 1,112 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓ Copper tested: 1480 ppb (limit: 1300 ppb)
Scc Dgs-South County Bldg
Groundwater 1,000 people served
0 violations
California Water Service Co-Lake Hughes
Groundwater 929 people served
0 violations
Lead tested: 3.3 ppb (limit: 15 ppb) ✓
California Water Service Co-Leona Valley
Purchased surface water 878 people served
0 violations
Lead tested: 5.5 ppb (limit: 15 ppb) ✓
Cws - Oak Ranch
Groundwater 844 people served
0 violations
Cws - Lower Bodfish Water System
Groundwater 736 people served
0 violations
Lead tested: 1.1 ppb (limit: 15 ppb) ✓
Cws - Tulco Water Company
Groundwater 716 people served
0 violations
Cwsc Country Meadows
Groundwater 621 people served
0 violations
Buena Vista Wc
Unknown 550 people served
0 violations
Scc P&R, Ed Levin Park
Groundwater 500 people served
0 violations
Armstrong Valley-Cal Water Service (Puc)
Groundwater 473 people served
0 violations
Lead tested: 3.2 ppb (limit: 15 ppb) ✓
San Jose Highlands
Groundwater 400 people served
0 violations
Coast Springs - Cal. Water Service (Puc)
Surface water 388 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓
Cws - Upper Bodfish Water System
Groundwater 307 people served
0 violations
Lead tested: 1.7 ppb (limit: 15 ppb) ✓
F M C
Groundwater 300 people served
0 violations
Al Hanford
Groundwater 300 people served
0 violations
Cws - Lakeland
Groundwater 294 people served
0 violations
Lead tested: 0.48 ppb (limit: 15 ppb) ✓
Cws Countrywood System
Groundwater 285 people served
0 violations
Cws-Onyx Water System
Groundwater 284 people served
0 violations
Lead tested: 1 ppb (limit: 15 ppb) ✓
San Jose Family Camp
Groundwater 230 people served
0 violations
Cws-Split Mountain Water System
Groundwater under influence of surface water 226 people served
0 violations
Lead tested: 3.1 ppb (limit: 15 ppb) ✓
Whiskey Slough Harbor
Groundwater 200 people served
0 violations
Woodside Mutual
Surface water 195 people served
0 violations
Cws - Fremont Valley
Groundwater 167 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓
Cws Mtn. Shadows Water System
Groundwater 162 people served
0 violations
Salt Creek Summer Homes
Groundwater 151 people served
0 violations
Lead tested: 3.7 ppb (limit: 15 ppb) ✓
Property Management Division
Groundwater 150 people served
0 violations
Cws - Mullen Water Company
Groundwater 138 people served
0 violations
Sun Garden Packing Company
Purchased groundwater 125 people served
0 violations
Cws-Grand Oaks Water System
Groundwater 122 people served
0 violations
Camp Sycamore
Purchased surface water 100 people served
0 violations
Rancho Del Paradiso-Cal Water Svc (Puc)
Purchased groundwater 94 people served
0 violations
Lead tested: 11.3 ppb (limit: 15 ppb) ✓ Copper tested: 1593 ppb (limit: 1300 ppb)
Hawkins Water Co-Cal Water Service (Puc)
Groundwater 81 people served
0 violations
Cws - Ponderosa
Groundwater 81 people served
0 violations
Noel Heights-Cal Water Service (Puc)
Groundwater under influence of surface water 79 people served
0 violations
Lead tested: 0.2 ppb (limit: 15 ppb) ✓
Rodeway Inn
Groundwater 70 people served
0 violations
Green Acres Mobile Park
All resolved Groundwater 29 people served
1 violation (5yr)
· All resolved
Terhel Farms Trailer Park 02
All resolved Groundwater 26 people served
1 violation (5yr)
· All resolved
Terhel Farms Trailer Park 01
All resolved Groundwater 26 people served
1 violation (5yr)
· All resolved
Santa Teresa Golf Club
Groundwater 25 people served
0 violations
Oasis Motel
Groundwater 25 people served
0 violations
Muriel Wright Residential Center
Purchased groundwater 5 people served
0 violations
Cws - Juniper Hills
Unknown 0
0 violations
Cws - Olcese
Surface water 0
0 violations
Cws - Arden Water Company
Groundwater 0
0 violations
Trailer Tel Rv Park
Purchased surface water 0
0 violations
Contaminants Found
Surface Water Treatment RuleHealth-Based
1 violation
All resolved
Revised Total Coliform RuleMonitoring
Missed testing deadlines — not a detection of bacteria.
5 violations
All resolved
NitrateMonitoring
At high levels, nitrate can cause blue baby syndrome in infants.
1 violation
All resolved
Lead & Copper Levels
Lead (Pb)
Within limit0 ppb measured
Action level: 15 ppb
Sampled: Jan 2025
Copper (Cu)
Exceeds limit1480 ppb measured
Action level: 1300 ppb
Sampled: Jul 2022
How Does This Compare?
San Jose (95112) has more violations than 60% of US ZIP codes. The national average is 18.87 violations per ZIP over 5 years. This ZIP has 7.
Fewer violations 60th 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.
Whole House Carbon Filter
A solid baseline for improving overall water quality. Reduces chlorine, sediment, and many common contaminants throughout your entire home.
Targets:Chlorine, Sediment, Taste & Odor
Look for:NSF/ANSI 42 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.