COUNTY REPORT CA

San Diego County, California

187 ZIP codes · Avg score 90/100 · Grade A · Updated

ZipCheckup grade for San Diego County: A.

No federal data flags a major home-safety concern for this ZIP.

Throughout San Diego County, the 187 monitored ZIP codes show low violation rates and healthy safety scores - a pattern that puts the county well above the state baseline for drinking water quality.

How San Diego County Compares

San Diego County90/100
California avg76/100
National avg73/100

How San Diego County Compares

A
County Grade
90/100
Avg Safety Score
187
ZIP Codes
36
Water Systems

San Diego County scores 14 points above the California state average (76/100) and 17 points above the national average (73/100).

Data: ZipCheckup Home Safety Score model 4.0.0; EPA SDWIS, UCMR 5, EPA radon zones, EPA AirData Last verified:

A
County Grade
90
Avg Safety Score
187
ZIP Codes
Best ZIP: 91901 (92/100)
Lowest ZIP: 92082 (70/100)
$767K
Median Home Value
$1,293
Avg Remediation (17% of home value)

ZIP Code Risk Map

Water Quality Map: San Diego County, California

Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.

A B C D F

Key Risk Factors

Health risk index: 10.2 (asthma 8.9%, diabetes 10%)

Estimated additional annual cost per homeowner: $3,689, driven primarily by wildfire

Violation History (2021–2025)

↓ Improving trend

EPA violation counts by year across San Diego County water systems. Health-based shown in red, total in blue.

2021
14 (14 health)
2022
118 (118 health)
2023
71 (71 health)
2024
78 (78 health)
2025
19 (19 health)

Peak year: 2022 with 118 violations. Past 5 years: 300 total (300 health-based). Health-based violations are declining versus the prior 2-year window.

Source: EPA SDWIS historical violations. Data may lag 6–12 months for the most recent year.

County Health Indicators vs National Average

Asthma 8.9% (national: 8.9%)
Diabetes 10% (national: 10.5%)
Obesity 25.3% (national: 32.4%)

Black markers indicate national averages. Source: CDC PLACES, Census ACS.

Infrastructure Overview

39/100
Infrastructure Stress Indicator
34%
ZIPs with High Infrastructure Stress

Modeled area-level indicator, not a failure probability. Sources: Census ACS housing age, EPA DWINS infrastructure needs, EPA SDWIS violations, and EPA lead indicators.

Compound Risk Breakdown

Estimated additional annual cost per homeowner: $3,689

Wildfire $2,400/yr
Flood $900/yr
Energy Code Gap $424/yr

Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).

Water Safety Affordability

How much it costs to fix water issues relative to home values in San Diego County

$767K
Median Home Value
$1,293
Est. Remediation Cost
0.2%
of Home Value
Remediation as % of home value low burden

Remediation costs are relatively manageable for most homeowners in San Diego County, representing a small fraction of property value.

Remediation includes water filtration, lead abatement, radon mitigation, and flood protection where applicable. Source: Census ACS, EPA SDWIS.

Health Outcomes vs National Average

CDC PLACES data for San Diego County residents

Asthma 8.9% (US avg: 8.9%)
Diabetes 10% (US avg: 11%)
Obesity 25.3% (US avg: 32.4%)

Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.

Water systems serving San Diego County

8 community water systems serving San Diego County.

Show all 8 water systems

36 total water systems serve San Diego County.

Systems with the most violations in San Diego County

5 water systems with recorded EPA violations.

All ZIP Codes in San Diego County

187 ZIP codes tracked in San Diego County.

# ZIP Code City Safety Score Grade Violations Home Value
1 91901 Alpine 92 A 0 $804K
2 91913 Chula Vista 92 A 0 $750K
3 91914 Chula Vista 92 A 0 $960K
4 91915 Chula Vista 92 A 0 $720K
5 91935 Jamul 92 A 0 $845K
6 91941 La Mesa 92 A 0 $885K
7 91942 La Mesa 92 A 0 $689K
8 91945 Lemon Grove 92 A 0 $641K
9 91977 Spring Valley 92 A 0 $624K
10 91978 Spring Valley 92 A 0 $597K
11 92003 Bonsall 92 A 0 $911K
12 92008 Carlsbad 92 A 0 $1142K
13 92010 Carlsbad 92 A 0 $1016K
14 92011 Carlsbad 92 A 0 $1188K
15 92019 El Cajon 92 A 0 $727K
16 92020 El Cajon 92 A 0 $742K
17 92025 Escondido 92 A 0 $767K
18 92027 Escondido 92 A 0 $666K
19 92037 La Jolla 92 A 0 $1858K
20 92054 Oceanside 92 A 0 $851K
21 92056 Oceanside 92 A 0 $696K
22 92057 Oceanside 92 A 0 $692K
23 92067 Rancho Santa Fe 92 A 0 $2000K
24 92071 Santee 92 A 0 $655K
25 92075 Solana Beach 92 A 0 $1938K
26 92083 Vista 92 A 0 $607K
27 92091 Rancho Santa Fe 92 A 0 $1695K
28 92093 La Jolla 92 A 0
29 92102 San Diego 92 A 0 $647K
30 92103 San Diego 92 A 0 $987K
31 92104 San Diego 92 A 0 $862K
32 92105 San Diego 92 A 0 $594K
33 92106 San Diego 92 A 0 $1359K
34 92107 San Diego 92 A 0 $1218K
35 92108 San Diego 92 A 0 $607K
36 92109 San Diego 92 A 0 $1136K
37 92110 San Diego 92 A 0 $885K
38 92111 San Diego 92 A 0 $754K
39 92113 San Diego 92 A 0 $559K
40 92114 San Diego 92 A 0 $604K
41 92115 San Diego 92 A 0 $723K
42 92116 San Diego 92 A 0 $899K
43 92117 San Diego 92 A 0 $914K
44 92119 San Diego 92 A 0 $833K
45 92120 San Diego 92 A 0 $870K
46 92121 San Diego 92 A 0 $1092K
47 92122 San Diego 92 A 0 $1005K
48 92123 San Diego 92 A 0 $800K
49 92124 San Diego 92 A 0 $869K
50 92126 San Diego 92 A 0 $802K
51 92127 San Diego 92 A 0 $1165K
52 92128 San Diego 92 A 0 $875K
53 92129 San Diego 92 A 0 $1018K
54 92130 San Diego 92 A 0 $1603K
55 92131 San Diego 92 A 0 $1108K
56 92134 San Diego 92 A 0
57 92135 San Diego 92 A 0
58 92136 San Diego 92 A 0
59 92139 San Diego 92 A 0 $599K
60 92140 San Diego 92 A 0
61 92145 San Diego 92 A 0
62 92161 San Diego 92 A 0
63 92182 San Diego 92 A 0
64 91932 Imperial Beach 91 A 1 (1 health) $811K
65 92004 Borrego Springs 91 A 1 $381K
66 92014 Del Mar 91 A 1 $2000K
67 92021 El Cajon 91 A 2 $572K
68 92028 Fallbrook 91 A 3 $781K
69 92055 Camp Pendleton 91 A 1
70 92058 Oceanside 91 A 1 $609K
71 92064 Poway 91 A 2 $972K
72 92118 Coronado 91 A 1 (1 health) $1999K
73 92173 San Ysidro 91 A 1 (1 health) $522K
74 92009 Carlsbad 90 A 2 $1220K
75 92026 Escondido 90 A 3 $664K
76 92029 Escondido 90 A 4 $912K
77 92069 San Marcos 90 A 1 $715K
78 92078 San Marcos 90 A 1 $874K
79 92081 Vista 90 A 1 $775K
80 92084 Vista 90 A 1 $746K
81 92061 Pauma Valley 87 A 42 (40 health) $785K
82 92065 Ramona 82 B 23 (4 health) $732K
83 91902 Bonita 75 B 0 $916K
84 91910 Chula Vista 75 B 0 $677K
85 91950 National City 75 B 0 $581K
86 92007 Cardiff By The Sea 75 B 1 $1808K
87 91911 Chula Vista 74 B 1 (1 health) $602K
88 92040 Lakeside 74 B 2 $649K
89 92154 San Diego 74 B 1 (1 health) $606K
90 92024 Encinitas 73 B 2 $1410K
91 92059 Pala 70 B 42 (40 health) $507K
92 92082 Valley Center 70 B 42 (40 health) $780K
93 91903 Alpine
94 91905 Boulevard $388K
95 91906 Campo $328K
96 91908 Bonita
97 91909 Chula Vista
98 91912 Chula Vista
99 91916 Descanso $616K
100 91917 Dulzura $757K
101 91921 Chula Vista
102 91931 Guatay
103 91933 Imperial Beach
104 91934 Jacumba $353K
105 91943 La Mesa
106 91944 La Mesa
107 91946 Lemon Grove
108 91948 Mount Laguna $273K
109 91951 National City
110 91962 Pine Valley $497K
111 91963 Potrero
112 91976 Spring Valley
113 91979 Spring Valley
114 91980 Tecate
115 91987 Tecate
116 91990 Potrero
117 92013 Carlsbad
118 92018 Carlsbad
119 92022 El Cajon
120 92023 Encinitas
121 92030 Escondido
122 92033 Escondido
123 92036 Julian 6 (2 health) $545K
124 92038 La Jolla
125 92039 La Jolla
126 92046 Escondido
127 92049 Oceanside
128 92051 Oceanside
129 92052 Oceanside
130 92060 Palomar Mountain $625K
131 92066 Ranchita $364K
132 92068 San Luis Rey
133 92070 Santa Ysabel 5 (2 health) $483K
134 92072 Santee
135 92074 Poway
136 92079 San Marcos
137 92085 Vista
138 92086 Warner Springs 5 $430K
139 92088 Fallbrook
140 92092 La Jolla 0
141 92096 San Marcos 1
142 92112 San Diego
143 92132 San Diego 0
144 92133 San Diego
145 92137 San Diego
146 92138 San Diego
147 92142 San Diego
148 92143 San Ysidro
149 92147 San Diego 0
150 92149 San Diego
151 92150 San Diego
152 92152 San Diego
153 92153 San Diego
154 92155 San Diego 1 (1 health)
155 92158 San Diego
156 92159 San Diego
157 92160 San Diego
158 92162 San Diego
159 92163 San Diego
160 92164 San Diego
161 92165 San Diego
162 92166 San Diego
163 92167 San Diego
164 92168 San Diego
165 92169 San Diego
166 92170 San Diego
167 92171 San Diego
168 92172 San Diego
169 92174 San Diego
170 92175 San Diego
171 92176 San Diego
172 92177 San Diego
173 92178 Coronado
174 92179 San Diego
175 92184 San Diego
176 92186 San Diego
177 92187 San Diego
178 92190 San Diego
179 92191 San Diego
180 92192 San Diego
181 92193 San Diego
182 92194 San Diego
183 92195 San Diego
184 92196 San Diego
185 92197 San Diego
186 92198 San Diego
187 92199 San Diego

Recommended Buyer Guides for San Diego County

While many sites publish identical guide lists across every county they cover, the selection here changes by location - driven by the EPA, NSF, FEMA, and CDC datasets that describe the actual conditions documented for this jurisdiction in the federal record.

Overview

San Diego County in California covers 187 tracked ZIP records with an average Home Safety Score of A (90/100) across 92 scored records.

31 of 100 ZIP codes with a reported violation count in the available EPA record have recorded EPA violations. 46 health-based violations appear in the available health breakdown.

← Back to California Home Safety Profile

Data Sources

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

Frequently Asked Questions

Is water safe in San Diego County?
San Diego County receives a grade of A, indicating generally safe tap water across its 187 ZIP codes.
How many water systems serve San Diego County?
San Diego County is served by 36 public water systems that supply drinking water to residents across 187 ZIP codes.
What is the biggest environmental risk in San Diego County?
The primary environmental risk factor in San Diego County is wildfire. This contributes to an estimated additional annual cost of $3,689 per homeowner.
How does San Diego County compare to California?
San Diego County has an average Home Safety Score of 90/100 under model 4.0.0, which is above the California state average of 76/100.

How to cite this page

APA ZipCheckup. (2026). San Diego County, CA: HSS 90/100; Lead Above EPA Limits. https://zipcheckup.com/county/california/san-diego/
BibTeX
@misc{zipcheckup-county-california-san-diego,
  author = {{ZipCheckup}},
  title  = {{San Diego County, CA: HSS 90/100; Lead Above EPA Limits}},
  year   = {2026},
  url    = {https://zipcheckup.com/county/california/san-diego/}
}

Page version: August 2026.

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