Water Quality in Lancaster, MN (56735)

EPA violation data for public water systems serving ZIP code 56735.

101

Total Violations

Health-Based

Monitoring / Reporting

Resolved

What does this mean?

98 of 101 violations have been resolved. 65 are health-based violations, meaning contaminant levels exceeded federal safety limits. The remaining 36 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: 10 Population served: 711

Violations Detail (101 total)

Contaminant	Category	MCL Limit	Measured	Date	Status	Health Effects
Public Notice	Monitoring	N/A	N/A	Oct 25, 2025	Active	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 30, 2025	Active	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 30, 2025	Active	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2025	Resolved	N/A
Arsenic	Health-Based	N/A	0.016	Jun 30, 2025	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.016	Jun 30, 2025	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.016	Jun 30, 2025	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.016	Jun 30, 2025	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Public Notice	Monitoring	N/A	N/A	May 10, 2025	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	May 10, 2025	Resolved	N/A
Arsenic	Health-Based	N/A	0.01725	Mar 31, 2025	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2025	Resolved	N/A
Arsenic	Health-Based	N/A	0.01725	Mar 31, 2025	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.01725	Mar 31, 2025	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.01725	Mar 31, 2025	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.0185	Dec 31, 2024	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Revised Total Coliform Rule	Monitoring	N/A	N/A	Dec 31, 2024	Resolved	N/A
Arsenic	Health-Based	N/A	0.0185	Dec 31, 2024	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Revised Total Coliform Rule	Monitoring	N/A	N/A	Dec 31, 2024	Resolved	N/A
Arsenic	Health-Based	N/A	0.0185	Dec 31, 2024	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.0185	Dec 31, 2024	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.0185	Dec 31, 2024	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Public Notice	Monitoring	N/A	N/A	Dec 7, 2024	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Dec 7, 2024	Resolved	N/A
Arsenic	Health-Based	N/A	0.02125	Sep 30, 2024	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Revised Total Coliform Rule	Monitoring	N/A	N/A	Sep 30, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Sep 30, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Sep 30, 2024	Resolved	N/A
Arsenic	Health-Based	N/A	0.02125	Sep 30, 2024	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.02125	Sep 30, 2024	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.02125	Sep 30, 2024	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.02125	Sep 30, 2024	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.02025	Jun 30, 2024	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.02025	Jun 30, 2024	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.02025	Jun 30, 2024	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.02025	Jun 30, 2024	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2024	Resolved	N/A
Arsenic	Health-Based	N/A	0.01825	Mar 31, 2024	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.01825	Mar 31, 2024	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.01825	Mar 31, 2024	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.01825	Mar 31, 2024	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.01825	Mar 31, 2024	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Public Notice	Monitoring	N/A	N/A	Feb 16, 2024	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Feb 16, 2024	Resolved	N/A
Arsenic	Health-Based	N/A	0.01875	Dec 31, 2023	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Revised Total Coliform Rule	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
Arsenic	Health-Based	N/A	0.01875	Dec 31, 2023	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.01875	Dec 31, 2023	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.01875	Dec 31, 2023	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.01975	Sep 30, 2023	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.01975	Sep 30, 2023	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.01975	Sep 30, 2023	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.01975	Sep 30, 2023	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.01975	Sep 30, 2023	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.0175	Jun 30, 2023	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.0175	Jun 30, 2023	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.0175	Jun 30, 2023	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.0175	Jun 30, 2023	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.0175	Jun 30, 2023	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.013	Dec 31, 2022	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.013	Dec 31, 2022	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.013	Dec 31, 2022	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.013	Dec 31, 2022	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.013	Dec 31, 2022	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.011	Sep 30, 2022	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.011	Sep 30, 2022	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.011	Sep 30, 2022	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.011	Sep 30, 2022	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.011	Sep 30, 2022	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.01175	Jun 30, 2022	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.01175	Jun 30, 2022	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.01175	Jun 30, 2022	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.01175	Jun 30, 2022	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.01175	Jun 30, 2022	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Chlorine	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	Eye and nose irritation; stomach discomfort
Chlorine	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	Eye and nose irritation; stomach discomfort
Chlorine	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	Eye and nose irritation; stomach discomfort
Arsenic	Health-Based	N/A	0.0113	Dec 31, 2021	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Revised Total Coliform Rule	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Arsenic	Health-Based	N/A	0.0113	Dec 31, 2021	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.0113	Dec 31, 2021	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.0113	Dec 31, 2021	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Revised Total Coliform Rule	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Arsenic	Health-Based	N/A	0.0113	Dec 31, 2021	Resolved	Skin damage; circulatory system problems; increased risk of cancer
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	0.011	Sep 30, 2021	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.011	Sep 30, 2021	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.011	Sep 30, 2021	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.011	Sep 30, 2021	Resolved	Skin damage; circulatory system problems; increased risk of cancer
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 & Copper Levels

Violation Timeline

2025(17)

Public Notice

Oct 25Active

Lead and Copper Rule

Sep 30Active

Lead and Copper Rule

Sep 30Active

Revised Total Coliform Rule

Jun 30Resolved

Revised Total Coliform Rule

Jun 30Resolved

Arsenic

Jun 30Resolved

Arsenic

Jun 30Resolved

Arsenic

Jun 30Resolved

Arsenic

Jun 30Resolved

Public Notice

May 10Resolved

Public Notice

May 10Resolved

Arsenic

Mar 31Resolved

Revised Total Coliform Rule

Mar 31Resolved

Revised Total Coliform Rule

Mar 31Resolved

Arsenic

Mar 31Resolved

Arsenic

Mar 31Resolved

Arsenic

Mar 31Resolved

2024(32)

Arsenic

Dec 31Resolved

Revised Total Coliform Rule

Dec 31Resolved

Arsenic

Dec 31Resolved

Revised Total Coliform Rule

Dec 31Resolved

Arsenic

Dec 31Resolved

Arsenic

Dec 31Resolved

Arsenic

Dec 31Resolved

Public Notice

Dec 7Resolved

Public Notice

Dec 7Resolved

Arsenic

Sep 30Resolved

Revised Total Coliform Rule

Sep 30Resolved

Revised Total Coliform Rule

Sep 30Resolved

Revised Total Coliform Rule

Sep 30Resolved

Arsenic

Sep 30Resolved

Arsenic

Sep 30Resolved

Arsenic

Sep 30Resolved

Arsenic

Sep 30Resolved

Arsenic

Jun 30Resolved

Arsenic

Jun 30Resolved

Arsenic

Jun 30Resolved

Arsenic

Jun 30Resolved

Revised Total Coliform Rule

Jun 30Resolved

Revised Total Coliform Rule

Jun 30Resolved

Revised Total Coliform Rule

Mar 31Resolved

Revised Total Coliform Rule

Mar 31Resolved

Arsenic

Mar 31Resolved

Arsenic

Mar 31Resolved

Arsenic

Mar 31Resolved

Arsenic

Mar 31Resolved

Arsenic

Mar 31Resolved

Public Notice

Feb 16Resolved

Public Notice

Feb 16Resolved

How Does This Compare?

Lancaster (56735) has 101 recorded violations, including 65 health-based. 3 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 →

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 Lancaster, MN (56735)

What does this mean?

Violations Detail (101 total)

Lead & Copper Levels

Violation Timeline

2025(17)

2024(32)

2023(16)

2022(15)

2021(21)

How Does This Compare?

Recommended Water Filters

Reverse Osmosis System

UV Water Purifier

Nearby ZIP Codes

Check Another ZIP Code