Water Quality in San Jose, CA (93257)
EPA violation data for public water systems serving ZIP code 93257.
Active Health Violations
43 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 95% of US ZIP codes.
Based on EPA compliance data. Not a substitute for an official water quality report from your utility.
80,467
Population
156
Water Systems
87
Violations (5yr)
43
Health-Based
Location
Loading map...
Water Systems Serving This Area (156)
Cws - Visalia
Groundwater 148,496 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓
Tulare, City Of
Groundwater 72,131 people served
0 violations
Porterville, City Of
1 health-based Groundwater 63,164 people served
2 violations (5yr)
· 1 health-based
Clm - Hobo Campground
Groundwater 5,200 people served
0 violations
Casillas Water System
Groundwater 3,000 people served
0 violations
Tule River Reservation Main
6 health-based Surface water 2,560 people served
31 violations (5yr)
· 6 health-based
Lead tested: 5 ppb (limit: 15 ppb) ✓
Rowland Wtr Co
Groundwater 1,500 people served
0 violations
Usfs - French Gulch Campground
Groundwater 1,000 people served
0 violations
Vandalia School
Groundwater 887 people served
0 violations
Burton School
Groundwater 800 people served
0 violations
Clm - Sandy Flat Campground
Groundwater 500 people served
0 violations
West Putnam School - Inactive
Groundwater 500 people served
0 violations
Lakeside Trailer Park
Groundwater 500 people served
0 violations
Alta Vista Elem School Dist
Groundwater 446 people served
0 violations
Rowland Water Co Nance Tract
Groundwater 350 people served
0 violations
Rowland Water Co Tract 213
Groundwater 350 people served
0 violations
Rowland Mulberry Tract
Groundwater 350 people served
0 violations
Porterville-Jones Corner
1 health-based Groundwater 339 people served
2 violations (5yr)
· 1 health-based
Lead tested: 0 ppb (limit: 15 ppb) ✓
Rockford School
1 health-based Groundwater 321 people served
2 violations (5yr)
· 1 health-based
Pan American Ballroom
Groundwater 300 people served
0 violations
Strathmore Minimart
Groundwater 300 people served
0 violations
Pleasant View School
Groundwater 300 people served
0 violations
Bob'S Tiny Mart
1 health-based Groundwater 265 people served
1 violation (5yr)
· 1 health-based · All resolved
Hope Elementary School
18 health-based Groundwater 255 people served
18 violations (5yr)
· 18 health-based · All resolved
Lead tested: 0 ppb (limit: 15 ppb) ✓
Summitt Charter Academy
Groundwater 250 people served
0 violations
Pleasant View West School
11 health-based Groundwater 220 people served
11 violations (5yr)
· 11 health-based · All resolved
Lead tested: 0 ppb (limit: 15 ppb) ✓
Hari'S Market
All resolved Groundwater 212 people served
1 violation (5yr)
· All resolved
Success Market
All resolved Groundwater 200 people served
1 violation (5yr)
· All resolved
Usfs/Logger-Aspen
Surface water 200 people served
0 violations
Rustlers
Groundwater 190 people served
0 violations
Westfield School
Groundwater 180 people served
0 violations
Panaderia La Cabana
All resolved Groundwater 155 people served
2 violations (5yr)
· All resolved
Ns Mini Mart
All resolved Groundwater 140 people served
2 violations (5yr)
· All resolved
Vandalia Irrigation District
Groundwater 100 people served
0 violations
Usfs-Jerkey Meadow Trailhead / Uhl Wc
Groundwater 96 people served
0 violations
Beverly Grand Mutual Water
Groundwater 92 people served
0 violations
Porterville Drive In
Groundwater 90 people served
0 violations
Spinner'S Race Track
Groundwater 90 people served
0 violations
Old Isabella Road Water System
Groundwater 90 people served
0 violations
Akin Water Company
All resolved Purchased groundwater 86 people served
1 violation (5yr)
· All resolved
Juranda Water Company
Groundwater 80 people served
0 violations
Usfs-Kennedy Campground
Groundwater 78 people served
0 violations
Shiloh Water Co.
Groundwater 75 people served
0 violations
Lake Success Mobile Lodge
1 health-based Groundwater 75 people served
2 violations (5yr)
· 1 health-based
Lead tested: 0 ppb (limit: 15 ppb) ✓
Porterville Racquet Club - Inactive
Groundwater 75 people served
0 violations
Spallina Water Company
Groundwater 70 people served
0 violations
Crystal Court
Groundwater 70 people served
0 violations
Cottage Court
Groundwater 63 people served
0 violations
Eagle'S Nest Resort
Groundwater 60 people served
0 violations
Tharp Real Properties
Groundwater 60 people served
0 violations
E.M. Tharp, Inc.
Groundwater 50 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓
The Seafood Cafe
Groundwater 50 people served
0 violations
Citrus South Tule School
Groundwater 50 people served
0 violations
Rup'S Market
Groundwater 50 people served
0 violations
Acid
Groundwater 50 people served
0 violations
Sunny Acres Preschool
Groundwater 50 people served
0 violations
Pavey'S Market
Groundwater 50 people served
0 violations
Army Corps Engs-Rocky Hill
Groundwater 50 people served
0 violations
Walnut Grove Trailer Park
Groundwater 48 people served
0 violations
Mama Marcina S
Groundwater 46 people served
0 violations
Valley Care Center
Groundwater 45 people served
0 violations
Ronald Sheldon
Groundwater 45 people served
0 violations
Tule River Cow Mountain
Groundwater 45 people served
0 violations
Teapot Dome Water Co
Groundwater 43 people served
0 violations
Sierra Mutual Water Company
2 health-based Groundwater 43 people served
2 violations (5yr)
· 2 health-based · All resolved
Lead tested: 0 ppb (limit: 15 ppb) ✓
Foothill Apartments
All resolved Groundwater 41 people served
1 violation (5yr)
· All resolved
Watertek Inc.
Groundwater 40 people served
0 violations
Pastime Bar & Grill
Groundwater 40 people served
0 violations
Prentice Water Company
Groundwater 40 people served
0 violations
The Roundup
Groundwater 35 people served
0 violations
Blackrock Station
Groundwater 32 people served
0 violations
Horse Meadow Work Center
Surface water 30 people served
0 violations
East Vandalia Water Co.
Groundwater 30 people served
0 violations
Success Mutual Water Company
Groundwater 30 people served
0 violations
Usfs-Blackrock Trailhead
Groundwater 30 people served
0 violations
Porterville Athletic Club
Groundwater 30 people served
0 violations
Deer Creek/Leavis Campground
Groundwater 30 people served
0 violations
Usfs-Democrat Fire Station Ws
Groundwater 29 people served
0 violations
Roundup
Groundwater 29 people served
0 violations
Usfs Sequoia Nf
Groundwater 25 people served
0 violations
Usfs Sequoia Nf
Groundwater 25 people served
0 violations
Usfs Sequoia Nf
Groundwater 25 people served
0 violations
Usfs Sequoia Nf
Groundwater 25 people served
0 violations
Usfs Sequoia Nf
Surface water 25 people served
0 violations
Usfs Sequoia Nf
Groundwater 25 people served
0 violations
Usfs-Johnsondale Work Center
Groundwater 25 people served
0 violations
Usfs Sequoia Nf
Groundwater 25 people served
0 violations
El Durango Water System
Groundwater 25 people served
0 violations
Usfs Sequoia Nf
Groundwater 25 people served
0 violations
Porter Vista Public Util.Dist
Groundwater 25 people served
0 violations
Usfs Sequoia Nf
Groundwater 25 people served
0 violations
Tule River Apple Valley
Groundwater 25 people served
7 violations (5yr)
Lead tested: 5 ppb (limit: 15 ppb) ✓
Frank'S Stop & Go
Groundwater 25 people served
0 violations
Usfs Sequoia Nf
Groundwater 25 people served
0 violations
Usfs Sequoia Nf
Groundwater 25 people served
0 violations
Usfs Sequoia Nf
Groundwater 25 people served
0 violations
Usfs Sequoia Nf
Groundwater 25 people served
0 violations
Usfs-Deer Creek/Leavis Campground
Groundwater 25 people served
0 violations
Usfs Kernville 13-56-15089
Groundwater 25 people served
0 violations
Suhovy Water System - Inactive
Groundwater 25 people served
0 violations
Ingraham Properties
Groundwater 25 people served
0 violations
Usfs-Beach Meadow
Groundwater 25 people served
0 violations
Truckers Mini Mart
Groundwater 25 people served
0 violations
Usfs Sequoia Nf
Groundwater 25 people served
0 violations
Usfs Sequoia Nf
Groundwater 25 people served
0 violations
Usace - Tule Recreation Area
1 health-based Groundwater 25 people served
1 violation (5yr)
· 1 health-based · All resolved
Lake Express Market
Groundwater 25 people served
0 violations
Usfs Sequoia Nf
Groundwater 25 people served
0 violations
Usfs Sequoia Nf
Groundwater 25 people served
0 violations
Spiegelberg Water System
Groundwater 25 people served
0 violations
Usfs Sequoia Nf
Groundwater 25 people served
0 violations
Usfs Sequoia Nf
Groundwater 25 people served
0 violations
Usfs Sequoia Nf
Groundwater 25 people served
0 violations
Usfs Sequoia Nf
Groundwater 25 people served
0 violations
Usfs Sequoia Nf
Groundwater 25 people served
0 violations
Usfs Sequoia Nf
Groundwater 25 people served
0 violations
Usfs Sequoia Nf
Groundwater 25 people served
0 violations
Usfs Uhl Ranger 13-53-1834
Groundwater 25 people served
0 violations
Usfs Sequoia Nf
Groundwater 25 people served
0 violations
Usfs Sequoia Nf
Groundwater 25 people served
0 violations
Usfs Sequoia Nf
Groundwater 25 people served
0 violations
Usfs Sequoia Nf
Surface water 25 people served
0 violations
Tim & Marias
Groundwater 25 people served
0 violations
Usfs Sequoia Nf
Groundwater 25 people served
0 violations
Usfs Sequoia Nf
Groundwater 25 people served
0 violations
Usfs Sequoia Nf
Groundwater 25 people served
0 violations
Usfs Sequoia Nf
Groundwater 25 people served
0 violations
Usfs Sequoia Nf
Groundwater 25 people served
0 violations
Usfs Sequoia Nf
Groundwater 25 people served
0 violations
Usfs Sequoia Nf
Groundwater 25 people served
0 violations
Usfs Sequoia Nf
Groundwater 25 people served
0 violations
Usfs Sequoia Nf
Groundwater 25 people served
0 violations
Usfs Sequoia Nf
Groundwater 25 people served
0 violations
Usfs Sequoia Nf
Groundwater 25 people served
0 violations
Curve Inn Cafe
Groundwater 25 people served
0 violations
Sally Trach Water System
Groundwater 25 people served
0 violations
Usfs Sequoia Nf
Groundwater 25 people served
0 violations
Usfs Sequoia Nf
Groundwater 25 people served
0 violations
Casey'S Water System
Groundwater 24 people served
0 violations
Army Corps Of Engineers
Groundwater 20 people served
0 violations
Small Steps Child Care Center
Groundwater 14 people served
0 violations
Usfs - Lk Isabella Office Water System
Groundwater 12 people served
0 violations
Usfs-Blackrock Station
Groundwater 12 people served
0 violations
Usfs-Hot Springs Ranger Station / Uhl Wc
Groundwater 11 people served
0 violations
Usfs Sequoia Nf
Groundwater 0
0 violations
Usfs Sequoia Nf
Surface water 0
0 violations
Usfs Sequoia Nf
Groundwater 0
0 violations
Usfs Sequoia Nf
Groundwater 0
0 violations
Usfs Sequoia Nf
Groundwater 0
0 violations
Usfs Sequoia Nf
Groundwater 0
0 violations
Usfs Sequoia Nf
Groundwater 0
0 violations
Usfs Sequoia Nf
Groundwater 0
0 violations
Gilbert Mutual
Groundwater 0
0 violations
Usfs Sequoia Nf
Groundwater 0
0 violations
Usfs Sequoia Nf
Surface water 0
0 violations
Usfs Sequoia Nf
Groundwater 0
0 violations
Contaminants Found
NitrateHealth-Based
At high levels, nitrate can cause blue baby syndrome in infants.
31 violations
All resolved
Revised Total Coliform RuleHealth-Based
Missed testing deadlines — not a detection of bacteria.
16 violations
All resolved
LEAD AND COPPER RULE REVISIONSHealth-Based
8 violations
Has active
Surface Water Treatment RuleHealth-Based
5 violations
All resolved
Groundwater RuleHealth-Based
3 violations
Has active
ChlorineMonitoring
Used to disinfect water — generally safe at regulated levels.
3 violations
All resolved
Total Haloacetic Acids (HAA5)Monitoring
3 violations
Has active
TTHMMonitoring
3 violations
Has active
Public NoticeMonitoring
3 violations
Has active
2,3,7,8-TCDDMonitoring
3 violations
All resolved
ArsenicMonitoring
A naturally occurring element that can cause cancer and other health effects at high levels.
2 violations
All resolved
UnknownMonitoring
2 violations
All resolved
EthylbenzeneMonitoring
1 violation
All resolved
Combined Radium (-226 and -228)Monitoring
1 violation
All resolved
Consumer Confidence RuleMonitoring
Annual water quality report delivery requirement.
1 violation
All resolved
Lead & Copper Levels
Lead (Pb)
Within limit0 ppb measured
Action level: 15 ppb
Sampled: Jan 2025
How Does This Compare?
San Jose (93257) has more violations than 95% of US ZIP codes. The national average is 18.87 violations per ZIP over 5 years. This ZIP has 87.
Fewer violations 95th 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
UV Water Purifier
Uses ultraviolet light to neutralize bacteria, viruses, and parasites without chemicals. Ideal for homes with microbial contamination concerns.
Targets:E. coli, Coliform, Giardia, Cryptosporidium
Look for:NSF/ANSI 55 (Class A) 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.