B74/100
CITY OF LA MARQUE — Water Quality Report 2026
Serving 15,154 people · Texas
Water Source
Purchased Surface Water
County
—
System ID
TX0840006
Violations
11
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | < 0.001 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
2
Violations (last 5yr)
1
Unresolved
0
Health-Related
TIER 3Unresolved
Disinfection byproduct treatment technique failure
When: October 1, 2023Rule: Ground Water RuleEnforcement: Informal — resolved cooperativelyVerify on EPA.gov
TIER 3Resolved
Monitoring Violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: September 1, 2022 – September 30, 2022Rule: Total Coliform RuleEnforcement: Resolving — corrective action underway
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Frequently Asked Questions About CITY OF LA MARQUE
Is CITY OF LA MARQUE water safe to drink?
CITY OF LA MARQUE water receives a grade of B (74/100), which is considered good. Out of 69 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has CITY OF LA MARQUE detected?
69 contaminants were tested in CITY OF LA MARQUE's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does CITY OF LA MARQUE have any EPA violations?
Yes, CITY OF LA MARQUE has 11 EPA violation(s) on record, with the most recent in 2023. Violation types include Other, MON, MR. 3 are health-based violations.
How many people does CITY OF LA MARQUE serve?
CITY OF LA MARQUE serves approximately 15,154 people, Texas.
What type of water does CITY OF LA MARQUE provide?
CITY OF LA MARQUE sources its water from purchased surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is TX0840006.
How does CITY OF LA MARQUE compare to other utilities in Texas?
CITY OF LA MARQUE scores 74/100 with a grade of B (good). This is an above-average performance for utilities statewide. Visit our Texas state page for a full comparison of water systems.