Water Quality in LANCASTER, CA (93536)

EPA violation data for public water systems serving ZIP code 93536.

87

Total Violations

68

Health-Based

19

Monitoring / Reporting

87

Resolved

What does this mean?

87 of 87 violations have been resolved. 68 are health-based violations, meaning contaminant levels exceeded federal safety limits. The remaining 19 are monitoring or reporting violations (missed testing deadlines or late paperwork — not necessarily a water quality issue). Not all violations mean your water is unsafe. The EPA requires reporting even for minor administrative issues.

Water systems: 20 Population served: 58,358

Violations Detail (87 total)

ContaminantCategoryMCL LimitMeasuredDateStatusHealth Effects
ArsenicHealth-BasedN/A18.38Mar 31, 2025ResolvedSkin damage; circulatory system problems; increased risk of cancer
ArsenicHealth-BasedN/A14.88Dec 31, 2024ResolvedSkin damage; circulatory system problems; increased risk of cancer
ArsenicHealth-BasedN/A15.88Sep 30, 2024ResolvedSkin damage; circulatory system problems; increased risk of cancer
ArsenicHealth-BasedN/A16.13Jun 30, 2024ResolvedSkin damage; circulatory system problems; increased risk of cancer
Consumer Confidence RuleMonitoringN/AN/AJun 30, 2024ResolvedN/A
Consumer Confidence RuleMonitoringN/AN/AJun 30, 2024ResolvedN/A
ArsenicHealth-BasedN/A16.5Mar 31, 2024ResolvedSkin damage; circulatory system problems; increased risk of cancer
ArsenicHealth-BasedN/A13Mar 31, 2024ResolvedSkin damage; circulatory system problems; increased risk of cancer
ArsenicHealth-BasedN/A13Mar 31, 2024ResolvedSkin damage; circulatory system problems; increased risk of cancer
Revised Total Coliform RuleMonitoringN/AN/AFeb 29, 2024ResolvedN/A

Lead & Copper Levels

Violation Timeline

2025(1)

Arsenic

02

Mar 31Resolved

2024(10)

Arsenic

02

Dec 31Resolved

Arsenic

02

Sep 30Resolved

Arsenic

02

Jun 30Resolved

Consumer Confidence Rule

71

Jun 30Resolved

Consumer Confidence Rule

71

Jun 30Resolved

Arsenic

02

Mar 31Resolved

Arsenic

02

Mar 31Resolved

Arsenic

02

Mar 31Resolved

Revised Total Coliform Rule

3A

Feb 29Resolved

Revised Total Coliform Rule

3A

Feb 29Resolved

How Does This Compare?

LANCASTER (93536) has 87 recorded violations, including 68 health-based. All violations have been resolved, which is a positive sign for current water quality. Consider testing your tap water independently for added peace of mind.

Recommended Water Filters

Based on the contaminants detected in your area, these filter types may help improve your water quality.

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

NSF Certified Products → EPA Safe Drinking Water Guide →

Activated Carbon Filter

Excellent for removing chlorine, chloramine, and disinfection byproducts like THMs and HAAs. Available as pitcher filters, countertop, or under-sink units.

Targets:THMs, HAAs, Chlorine, Chloramine, Taste & Odor

Look for:NSF/ANSI 42 & 53 certified

NSF Certified Products → EPA Safe Drinking Water Guide →

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

NSF Certified Products → EPA Safe Drinking Water Guide →

Always look for filters certified by NSF International for the specific contaminants you want to remove.

Nearby ZIP Codes

Check Another ZIP Code