Water Quality in PASO ROBLES, CA (93446)

EPA violation data for public water systems serving ZIP code 93446.

Total Violations

Health-Based

Monitoring / Reporting

Resolved

What does this mean?

69 of 71 violations have been resolved. 52 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: 39 Population served: 38,422

Violations Detail (71 total)

Contaminant	Category	MCL Limit	Measured	Date	Status	Health Effects
Revised Total Coliform Rule	Monitoring	N/A	N/A	May 31, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	May 31, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	May 31, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2025	Resolved	N/A
LEAD AND COPPER RULE REVISIONS	Monitoring	N/A	N/A	Oct 16, 2024	Active	N/A
LEAD AND COPPER RULE REVISIONS	Health-Based	N/A	N/A	Oct 16, 2024	Active	N/A
Arsenic	Health-Based	N/A	20	Mar 31, 2024	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	20	Mar 31, 2024	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Total Haloacetic Acids (HAA5)	Health-Based	N/A	0.062	Dec 31, 2023	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	0.062	Dec 31, 2023	Resolved	N/A
Nitrate	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Arsenic	Health-Based	N/A	17	Dec 31, 2023	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	17	Dec 31, 2023	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Total Haloacetic Acids (HAA5)	Health-Based	N/A	0.067	Sep 30, 2023	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	0.067	Sep 30, 2023	Resolved	N/A
Arsenic	Health-Based	N/A	17	Sep 30, 2023	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	17	Sep 30, 2023	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 30, 2023	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 30, 2023	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	0.076	Jun 30, 2023	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	0.076	Jun 30, 2023	Resolved	N/A
Arsenic	Health-Based	N/A	19	Jun 30, 2023	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	19	Jun 30, 2023	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Total Haloacetic Acids (HAA5)	Health-Based	N/A	0.082	Mar 31, 2023	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	0.082	Mar 31, 2023	Resolved	N/A
Arsenic	Health-Based	N/A	19	Mar 31, 2023	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	19	Mar 31, 2023	Resolved	Skin damage; circulatory system problems; increased risk of cancer
TTHM	Health-Based	N/A	0.082	Dec 31, 2022	Resolved	N/A
TTHM	Health-Based	N/A	0.082	Dec 31, 2022	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	0.097	Dec 31, 2022	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	0.097	Dec 31, 2022	Resolved	N/A
Nitrate	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Nitrate	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Nitrate	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	0.113	Sep 30, 2022	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	0.113	Sep 30, 2022	Resolved	N/A
TTHM	Health-Based	N/A	0.086	Sep 30, 2022	Resolved	N/A
TTHM	Health-Based	N/A	0.086	Sep 30, 2022	Resolved	N/A
Arsenic	Health-Based	N/A	19	Sep 30, 2022	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	19	Sep 30, 2022	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Fluoride	Health-Based	N/A	0.9	Sep 30, 2022	Resolved	Bone disease (pain and tenderness of the bones); children may get mottled teeth
Fluoride	Health-Based	N/A	0.9	Sep 30, 2022	Resolved	Bone disease (pain and tenderness of the bones); children may get mottled teeth
Total Haloacetic Acids (HAA5)	Health-Based	N/A	0.093	Jun 30, 2022	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	0.093	Jun 30, 2022	Resolved	N/A
Arsenic	Health-Based	N/A	0.019	Jun 30, 2022	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.019	Jun 30, 2022	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	19	Jun 30, 2022	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	19	Jun 30, 2022	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Fluoride	Health-Based	N/A	1.7	Jun 30, 2022	Resolved	Bone disease (pain and tenderness of the bones); children may get mottled teeth
Fluoride	Health-Based	N/A	1.7	Jun 30, 2022	Resolved	Bone disease (pain and tenderness of the bones); children may get mottled teeth
Total Haloacetic Acids (HAA5)	Health-Based	N/A	0.083	Mar 31, 2022	Resolved	N/A
Total Haloacetic Acids (HAA5)	Health-Based	N/A	0.083	Mar 31, 2022	Resolved	N/A
Arsenic	Health-Based	N/A	17	Mar 31, 2022	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	17	Mar 31, 2022	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	17	Dec 31, 2021	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	17	Dec 31, 2021	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Selenium	Health-Based	N/A	140	Sep 30, 2021	Resolved	Hair or fingernail loss; numbness in fingers or toes; circulatory problems
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 30, 2021	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 30, 2021	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 30, 2021	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 30, 2021	Resolved	N/A
Arsenic	Health-Based	N/A	18	Sep 30, 2021	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	18	Sep 30, 2021	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	18	Jun 30, 2021	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	18	Jun 30, 2021	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	18	Apr 4, 2021	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	18	Apr 4, 2021	Resolved	Skin damage; circulatory system problems; increased risk of cancer

Lead & Copper Levels

Violation Timeline

2025(6)

Revised Total Coliform Rule

May 31Resolved

Revised Total Coliform Rule

May 31Resolved

Revised Total Coliform Rule

May 31Resolved

Revised Total Coliform Rule

Apr 30Resolved

Revised Total Coliform Rule

Apr 30Resolved

Revised Total Coliform Rule

Apr 30Resolved

2024(4)

LEAD AND COPPER RULE REVISIONS

Oct 16Active

LEAD AND COPPER RULE REVISIONS

Oct 16Active

Arsenic

Mar 31Resolved

Arsenic

Mar 31Resolved

How Does This Compare?

PASO ROBLES (93446) has 71 recorded violations, including 52 health-based. 2 remain unresolved. 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.

Water Quality in PASO ROBLES, CA (93446)

What does this mean?

Violations Detail (71 total)

Lead & Copper Levels

Violation Timeline

2025(6)

2024(4)

2023(19)

2022(29)

2021(13)

How Does This Compare?

Recommended Water Filters

Reverse Osmosis System

Activated Carbon Filter

UV Water Purifier

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