Water Quality in MERCEDES, TX (78570)

EPA violation data for public water systems serving ZIP code 78570.

135

Total Violations

Health-Based

121

Monitoring / Reporting

113

Resolved

What does this mean?

113 of 135 violations have been resolved. 14 are health-based violations, meaning contaminant levels exceeded federal safety limits. The remaining 121 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: 5 Population served: 17,858

Violations Detail (135 total)

Contaminant	Category	MCL Limit	Measured	Date	Status	Health Effects
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 28, 2025	Active	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 28, 2025	Active	N/A
Public Notice	Monitoring	N/A	N/A	Apr 30, 2025	Active	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Mar 31, 2025	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Mar 31, 2025	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Mar 31, 2025	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Mar 31, 2025	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Mar 9, 2025	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Mar 9, 2025	Resolved	N/A
LEAD AND COPPER RULE REVISIONS	Health-Based	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
LEAD AND COPPER RULE REVISIONS	Monitoring	N/A	N/A	Oct 16, 2024	Active	N/A
LEAD AND COPPER RULE REVISIONS	Monitoring	N/A	N/A	Oct 16, 2024	Active	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 28, 2024	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 28, 2024	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 28, 2024	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 28, 2024	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 28, 2024	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 28, 2024	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Mar 30, 2024	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Mar 30, 2024	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Mar 30, 2024	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 28, 2023	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 28, 2023	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 28, 2023	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 28, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Aug 16, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Aug 16, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Aug 16, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Aug 16, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Aug 12, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Aug 12, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Aug 12, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Aug 12, 2023	Resolved	N/A
Consumer Confidence Rule	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	N/A
Consumer Confidence Rule	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	N/A
Consumer Confidence Rule	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	N/A
Consumer Confidence Rule	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	May 10, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	May 10, 2023	Resolved	N/A
Nitrite	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Nitrite	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Nitrite	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Nitrite	Monitoring	N/A	N/A	Mar 31, 2023	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	Mar 31, 2023	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Nitrite	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
Nitrite	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
Nitrite	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
Nitrite	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
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
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
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
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
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
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
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Dec 3, 2022	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Dec 3, 2022	Resolved	N/A
Lead and Copper Rule	Health-Based	N/A	N/A	Sep 30, 2022	Active	N/A
Lead and Copper Rule	Health-Based	N/A	N/A	Sep 30, 2022	Active	N/A
Lead and Copper Rule	Health-Based	N/A	N/A	Sep 30, 2022	Active	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Consumer Confidence Rule	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Consumer Confidence Rule	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Consumer Confidence Rule	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Consumer Confidence Rule	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Consumer Confidence Rule	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Consumer Confidence Rule	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Consumer Confidence Rule	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Jun 10, 2022	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Jun 10, 2022	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Jun 10, 2022	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Jun 10, 2022	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Jun 10, 2022	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Jun 10, 2022	Resolved	N/A
Lead and Copper Rule	Health-Based	N/A	N/A	Mar 31, 2022	Active	N/A
Lead and Copper Rule	Health-Based	N/A	N/A	Mar 31, 2022	Active	N/A
Lead and Copper Rule	Health-Based	N/A	N/A	Mar 31, 2022	Active	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
Lead and Copper Rule	Health-Based	N/A	N/A	Mar 30, 2022	Active	N/A
Lead and Copper Rule	Health-Based	N/A	N/A	Mar 30, 2022	Active	N/A
Lead and Copper Rule	Health-Based	N/A	N/A	Mar 30, 2022	Active	N/A
Lead and Copper Rule	Health-Based	N/A	N/A	Feb 25, 2022	Active	N/A
Lead and Copper Rule	Health-Based	N/A	N/A	Feb 25, 2022	Active	N/A
Lead and Copper Rule	Health-Based	N/A	N/A	Feb 25, 2022	Active	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 29, 2021	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 29, 2021	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 30, 2021	Active	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 30, 2021	Active	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 30, 2021	Active	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 28, 2021	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 28, 2021	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 28, 2021	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Aug 22, 2021	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Aug 22, 2021	Resolved	N/A
Consumer Confidence Rule	Monitoring	N/A	N/A	Jun 30, 2021	Resolved	N/A
Consumer Confidence Rule	Monitoring	N/A	N/A	Jun 30, 2021	Resolved	N/A
Consumer Confidence Rule	Monitoring	N/A	N/A	Jun 30, 2021	Resolved	N/A
Consumer Confidence Rule	Monitoring	N/A	N/A	Jun 30, 2021	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Mar 31, 2021	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Mar 31, 2021	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Mar 31, 2021	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Mar 10, 2021	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Mar 10, 2021	Resolved	N/A

Lead & Copper Levels

Violation Timeline

2025(9)

Lead and Copper Rule

Sep 28Active

Lead and Copper Rule

Sep 28Active

Public Notice

Apr 30Active

Lead and Copper Rule

Mar 31Resolved

Lead and Copper Rule

Mar 31Resolved

Lead and Copper Rule

Mar 31Resolved

Lead and Copper Rule

Mar 31Resolved

Public Notice

Mar 9Resolved

Public Notice

Mar 9Resolved

2024(13)

LEAD AND COPPER RULE REVISIONS

Oct 16Active

LEAD AND COPPER RULE REVISIONS

Oct 16Active

LEAD AND COPPER RULE REVISIONS

Oct 16Active

LEAD AND COPPER RULE REVISIONS

Oct 16Active

Lead and Copper Rule

Sep 28Resolved

Lead and Copper Rule

Sep 28Resolved

Lead and Copper Rule

Sep 28Resolved

Lead and Copper Rule

Sep 28Resolved

Lead and Copper Rule

Sep 28Resolved

Lead and Copper Rule

Sep 28Resolved

Lead and Copper Rule

Mar 30Resolved

Lead and Copper Rule

Mar 30Resolved

Lead and Copper Rule

Mar 30Resolved

How Does This Compare?

MERCEDES (78570) has 135 recorded violations, including 14 health-based. 22 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 →

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

Water Quality in MERCEDES, TX (78570)

What does this mean?

Violations Detail (135 total)

Lead & Copper Levels

Violation Timeline

2025(9)

2024(13)

2023(28)

2022(58)

2021(27)

How Does This Compare?

Recommended Water Filters

Reverse Osmosis System

Nearby ZIP Codes

Check Another ZIP Code