STATE REPORT CA 614 HEALTH VIOLATIONS

California Home Safety Profiles by ZIP

2630 ZIP codes · 1065 water systems · UPC plumbing code · Updated

Data: ZipCheckup Home Safety Score model 4.0.0; EPA SDWIS, UCMR 5, EPA radon zones, EPA AirData, NWS, State plumbing boards, Rewiring America

ZipCheckup tracks drinking-water and home-safety data for 2,630 ZIP codes across California, covering 1,065 public water systems that serve about 36,436,452 people. 622 ZIP codes carry at least one EPA violation on record.

2630
ZIP Codes
1065
Water Systems
622
ZIPs with Violations
UPC
Plumbing Code
B · 76
Avg Safety Score
7
ZIPs Exceeding Lead Limit
3%
High Radon Risk (Zone 1)
#17
of 50 States
75%
ZIPs Rated A or B
42%
ZIPs with Violations
B
California average: 76/100 - ranked #17 of 50 states. 3 points above the national average (73). 75% of ZIP codes scored A or B.

Statewide monitoring data places California in the above-average tier for public drinking water safety.

Score Distribution

How California's 2630 ZIP codes are distributed across safety grades.

260
A
524
B
229
C
33
D
0
F
85-10070-8455-6940-540-39

Home Safety Scores by State

Loading map…
F (0-39) D (40-54) C (55-69) B (70-84) A (85+)

Model 4.0.0 inputs: EPA SDWIS, UCMR5 PFAS, EPA radon zones, annual county AQI •

Top 10 Safest ZIP Codes in California

Highest Home Safety Scores in the state.

#ZIP CodeCityCountyScoreGrade
1 94556 MoragaSonoma 100 A
2 94571 Rio VistaSolano 100 A
3 94589 VallejoSolano 100 A
4 94590 VallejoSolano 100 A
5 94901 San RafaelMarin 100 A
6 94903 San RafaelMarin 100 A
7 94904 GreenbraeMarin 100 A
8 94920 Belvedere TiburonMarin 100 A
9 94924 BolinasMarin 100 A
10 94925 Corte MaderaMarin 100 A

10 Lowest-Scoring ZIP Codes in California

#ZIP CodeCityCountyScoreGradeViolations
1 93307 BakersfieldKern 42 D 29
2 91732 El MonteLos Angeles 42 D 12
3 93455 Santa MariaSanta Barbara 43 D 46
4 93012 CamarilloVentura 43 D 10
5 92860 NorcoRiverside 44 D 45
6 93292 VisaliaTulare 46 D 10
7 93561 TehachapiKern 47 D 11
8 91710 ChinoSan Bernardino 47 D 5
9 93308 BakersfieldKern 48 D 9
10 92320 CalimesaRiverside 49 D 19

County Rankings

Water quality breakdown by county. 58 counties with data in California.

Loading county map…
F (0-39) D (40-54) C (55-69) B (70-84) A (85+)

County-level aggregation of measured ZIP Home Safety Scores • EPA SDWIS, UCMR 5 PFAS, EPA radon zones, EPA AirData

CountyAvg ScoreGradeZIPsBest ZIPWorst ZIP
06037 69 C 516 90001 (75) 91732 (42)
06059 83 B 150 90740 (92) 92804 (70)
06111 63 C 48 91307 (67) 93012 (43)
06071 65 C 120 91701 (75) 91710 (47)
06065 70 B 100 91752 (75) 92860 (44)
06073 90 A 187 91901 (92) 92082 (70)
06025 88 A 18 92233 (92) 92251 (83)
06027 74 B 12 93546 (74) 93546 (74)
06083 57 C 40 93013 (58) 93455 (43)
06107 65 C 43 93212 (75) 93292 (46)
06031 89 A 8 93246 (92) 93230 (86)
06029 65 C 68 93224 (75) 93307 (42)
06019 62 C 98 93210 (75) 93727 (54)
06079 77 B 34 93401 (83) 93446 (59)
06053 75 B 36 93905 (83) 93924 (66)
06051 83 B 7 93514 (83) 93514 (83)
06015 91 A 7 95531 (91) 95531 (91)
06039 76 B 13 93604 (83) 93614 (52)
06047 89 A 22 95324 (100) 95301 (75)
06043 N/A N/A 8 N/A N/A
06081 N/A N/A 37 N/A N/A
06085 N/A N/A 108 N/A N/A
06075 N/A N/A 59 N/A N/A
06067 85 A 131 95610 (100) 95864 (75)
06001 N/A N/A 67 N/A N/A
06055 N/A N/A 13 N/A N/A
06013 N/A N/A 51 N/A N/A
06095 93 A 16 94571 (100) 95688 (83)
06033 99 A 16 95451 (100) 95453 (96)
06097 95 A 52 94556 (100) 95476 (69)
06041 100 A 42 94901 (100) 94973 (100)
06087 73 B 22 95003 (83) 95033 (53)
06069 60 C 5 95023 (60) 95023 (60)
06077 85 A 44 95304 (100) 95336 (81)
06009 81 B 21 95224 (83) 95251 (78)
06109 75 B 15 95310 (83) 95305 (56)
06099 83 B 29 95316 (92) 95351 (67)
06045 93 A 27 95470 (100) 95482 (78)
06023 99 A 38 95501 (100) 95546 (95)
06105 83 B 12 96093 (83) 96093 (83)
06093 94 A 21 96097 (96) 96067 (92)
06005 79 B 12 95640 (80) 95685 (76)
06061 74 B 31 95602 (75) 95648 (58)
06113 99 A 23 95616 (100) 95605 (96)
06017 82 B 31 95613 (83) 96150 (61)
06003 N/A N/A 2 N/A N/A
06101 100 A 10 95953 (100) 95993 (100)
06115 N/A N/A 12 N/A N/A
06057 79 B 13 95945 (83) 96161 (67)
06091 N/A N/A 7 N/A N/A
06011 99 A 5 95932 (99) 95987 (99)
06021 91 A 8 95988 (100) 95963 (82)
06007 86 A 26 95966 (100) 95973 (79)
06063 82 B 15 95971 (82) 95971 (82)
06089 89 A 31 96008 (100) 96003 (75)
06049 N/A N/A 11 N/A N/A
06035 N/A N/A 14 N/A N/A
06103 89 A 16 96021 (99) 96080 (75)

Most Common Contaminants in California

Contaminant / RuleCategoryZIPs AffectedViolationsHealth Risk
Stage 2 DBP Rule Treatment Technique 225 574 Yes
Consumer Confidence Report Rule Reporting 213 394 Yes
Stage 1 DBP Rule Treatment Technique 153 182 No
Lead Inorganic 141 465 Yes
Haloacetic Acids (HAA5) Disinfection Byproducts 131 291 Yes
Total Trihalomethanes (TTHM) Disinfection Byproducts 128 243 Yes
E. coli Microbiological 53 61 Yes
Total Coliform Microbiological 38 43 No

Overview

We track multi-source home safety signals for 2630 ZIP records across California. Home Safety Score model 4.0.0 is published for 1046 scored records; missing required evidence suppresses the score.

The EPA snapshots used for this build directly map water systems to 1479 ZIP records, covering 1065 community water systems that serve approximately 36,436,452 people.

622 of 1479 ZIP codes with a reported violation count in the available EPA record (42%) have recorded EPA violations. 614 health-based violations appear in the available health breakdown.

Plumbing Regulations

California follows the California Plumbing Code (based on UPC) (2022 edition).

  • Plumbing code: UPC (2022)
  • Homeowner DIY: Licensed plumber required
  • Water heater permit: Required
  • Annual backflow test: Required
  • Seismic strapping: Required

Full California regulations →

Areas with Most Violations

ZIP Code City Home Safety Grade Violations Health-Based System
92880 Corona C 46 1 Jurupa Community Sd
93455 Santa Maria D 46 0 Golden State Water Company - Orcutt
92503 Riverside C 45 1 City of Riverside,
92860 Norco D 45 1 City of Norco,
92256 Morongo Valley — 43 42 Csa 70-f Morongo
92059 Pala B 42 40 Rainbow Municipal Water District
92061 Pauma Valley A 42 40 Valley Center Mwd
92082 Valley Center B 42 40 Valley Center Mwd
93257 Porterville D 41 38 City of Porterville,
93247 Lindsay C 39 39 City of Lindsay,

Areas with No Violations

ZIP Code City Home Safety Grade System Population
90001 Los Angeles B Gswc - Florence/graham 63,472
90002 Los Angeles B Los Angeles-city, Department of Water & Power 3,875,566
90003 Los Angeles B Los Angeles-city, Department of Water & Power 3,875,566
90004 Los Angeles B Los Angeles-city, Department of Water & Power 3,875,566
90005 Los Angeles B Los Angeles-city, Department of Water & Power 3,875,566
90006 Los Angeles B Los Angeles-city, Department of Water & Power 3,875,566
90007 Los Angeles B Los Angeles-city, Department of Water & Power 3,875,566
90008 Los Angeles B Los Angeles-city, Department of Water & Power 3,875,566
90010 Los Angeles B Los Angeles-city, Department of Water & Power 3,875,566
90011 Los Angeles B Los Angeles-city, Department of Water & Power 3,875,566

Home Safety Score

Average Home Safety Score for California: B (76/100) across 1046 scored of 2630 tracked ZIP records.

Model 4.0.0 uses the canonical components water-compliance, pfas-mcl-screen, radon-zone, annual-aqi across 3 required domains. The sections below provide additional context and do not change that score. Missing required evidence suppresses the score, and a favorable result is not a property-level safety certification.

Lead & Copper

  • Average lead level (90th percentile): 0.0025 mg/L (EPA action level: 0.015 mg/L)
  • 7 of 1479 ZIP codes with known status exceed the EPA lead action level

Radon Risk

  • High risk (Zone 1): 86 ZIP codes (3%)
  • Moderate risk (Zone 2): 1547 ZIP codes
  • Low risk (Zone 3): 997 ZIP codes

ZIP Code Reports for California

Largest Communities

ZIP Code City Population Safety Grade Violations
90248 Gardena 4,429,856 B 0
90059 Los Angeles 4,332,314 B 0
90045 Los Angeles 4,293,087 B 1
90061 Los Angeles 4,254,554 B 0
90041 Los Angeles 4,228,694 B 0
90047 Los Angeles 4,198,024 B 0
91321 Newhall 4,169,656 C 0
90044 Los Angeles 4,153,306 B 0
90247 Gardena 4,153,306 B 0
90501 Torrance 4,146,001 B 0
91214 La Crescenta 4,100,191 C 0
90039 Los Angeles 4,064,350 B 0
91304 Canoga Park 4,044,852 B 1
91311 Chatsworth 4,044,852 B 1
90710 Harbor City 4,039,818 B 0
90023 Los Angeles 4,032,245 C 0
90032 Los Angeles 4,028,040 C 0
90063 Los Angeles 4,028,040 C 0
90502 Torrance 4,019,562 B 0
90002 Los Angeles 4,006,005 B 0

Lowest Published Home Safety Scores

ZIP Code City Score Grade Violations
91732 El Monte 42 D 12
93307 Bakersfield 42 D 29
93012 Camarillo 43 D 10
93455 Santa Maria 43 D 46
92860 Norco 44 D 45

Highest Published Home Safety Scores

ZIP Code City Score Grade Violations
94556 Moraga 100 A 0
94571 Rio Vista 100 A 0
94589 Vallejo 100 A 0
94590 Vallejo 100 A 0
94901 San Rafael 100 A 0

All 2630 ZIP Codes in California

Data Sources

Reporting periods vary by source. Missing data is shown as unavailable, not as zero.

Largest water systems in California

The 12 biggest community water systems serving California, of 1065 total.

Show all 12 water systems

Systems with the most violations in California

12 systems in California with the most recorded EPA violations.

Frequently Asked Questions

Is the water safe to drink in California?

California has 1065 community water systems serving 36,436,452 people across 2630 ZIP codes. There are 1,419 recorded violations, including 614 health-based. 622 of 2630 ZIP codes have at least one violation.

What plumbing code does California follow?

California follows the UPC plumbing code. A licensed plumber is generally required for plumbing work.

Is lead a concern in California's drinking water?

7 ZIP codes in California have lead levels exceeding the EPA action level of 0.015 mg/L.

What is the radon risk in California?

3% of ZIP codes in California fall in EPA Radon Zone 1 (highest risk).

How to cite this page

APA ZipCheckup. (2026). California Home Safety Profiles by ZIP. https://zipcheckup.com/states/california/
BibTeX 
@misc{zipcheckup-states-california,
  author = {{ZipCheckup}},
  title  = {{California Home Safety Profiles by ZIP}},
  year   = {2026},
  url    = {https://zipcheckup.com/states/california/}
}

Page version: August 2026.

Get safety alerts for California

Free updates when EPA data changes for this area. No spam.

Unsubscribe anytime. Privacy Policy.

Share This Page

X Facebook
Violations found - check filter options Free tool - no phone call required.