Pomona, CA 91768

2 water systems • 181,567 residents

Excellent water quality with minimal contaminants

A

Score: 81/100

Graded on EPA violations, contaminants, severity, compliance, and enforcement history. See methodology.

Data updated June 2026 • Sources: EPA ECHO and EPA Envirofacts

25

Contaminants Detected

48

Violations on Record

20

Health-Based Violations

0

Recent Violations

Grade Breakdown

Contaminant Count0 / 25
Violation History22 / 25
Contaminant Severity12 / 25
System Compliance0 / 15
Enforcement History0 / 10
Total Score81%

81 / 100 points

Recommended Water Filters

  • ✓Point-of-Use Carbon Filter (NSF-certified for lead)
  • ✓Ultraviolet (UV) Purification
Compare filter types in our Filter Guide →

Consult a water quality specialist for personalized recommendations.

Pomona vs CA & National Average

Detected Contaminants

25 contaminants detected across water systems serving this ZIP code

ContaminantCategory
TTHMDisinfection Byproduct
LEAD AND COPPER RULE REVISIONSHeavy Metal
Coliform (TCR)Microorganism
1,1,1-TrichloroethaneOther
1,1,2-TrichloroethaneOther
1,2-DichloropropaneOther
DICHLOROMETHANEOther
Surface Water Treatment RuleOther
1,1-DichloroethyleneVolatile Organic
1,2-DichloroethaneVolatile Organic
1,2,4-TrichlorobenzeneVolatile Organic
BenzeneVolatile Organic
Carbon tetrachlorideVolatile Organic
CHLOROBENZENEVolatile Organic
cis-1,2-DichloroethyleneVolatile Organic
EthylbenzeneVolatile Organic
o-DichlorobenzeneVolatile Organic
p-DichlorobenzeneVolatile Organic
StyreneVolatile Organic
TetrachloroethyleneVolatile Organic
TolueneVolatile Organic
trans-1,2-DichloroethyleneVolatile Organic
TrichloroethyleneVolatile Organic
Vinyl chlorideVolatile Organic
Xylenes, TotalVolatile Organic

Water System Information

Systems Serving This ZIP:
POMONA - CITY, WATER DEPT., CALIF STATE POLYTECHNICAL UNIV - POMONA
Population Served:
181,567
Systems With Violations:
2 of 2
Major Violations:
0
Enforcement Actions:
25

Nearby Areas

90012

Los Angeles

A

90014

Los Angeles

D

90025

Los Angeles

A

90034

Los Angeles

A

90045

Los Angeles

D

90046

Los Angeles

F

Frequently Asked Questions

What does the grade mean?

Our A–F grade ranks this ZIP code's water quality against every other analyzed ZIP in the country, based on EPA data. A = among the best, F = among the most troubled.

Is my tap water safe to drink?

Water systems regulated by the EPA must comply with Safe Drinking Water Act standards. However, if you're concerned about water quality, consider a water filter appropriate for your contaminants.

How often is the data updated?

We update our data quarterly with the latest EPA ECHO and Envirofacts data. Historical violations are tracked to identify patterns.

What filters do you recommend?

Filter recommendations are based on detected contaminants in your area. See our Filter Guide for detailed information about different filter types.