D36/100
PATTERSON WATER SYSTEM — Water Quality Report 2026
Serving 8,456 people · Louisiana
Water Source
Surface Water
County
—
System ID
LA1101006
Violations
16
Contaminant Test Results
EPA Violation History
5
Violations (last 5yr)
4
Unresolved
4
Health-Related
TIER 2Unresolved
Exceeded the Maximum Contaminant Level (running average)
When: July 1, 2025 – September 30, 2025Rule: Stage 2 DBPREnforcement: Informal — resolved cooperativelyVerify on EPA.gov
TIER 3Resolved
Disinfection byproduct treatment technique failure
When: April 29, 2025 – August 20, 2025Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 2Unresolved
Exceeded the Maximum Contaminant Level (running average)
When: April 1, 2025 – June 30, 2025Rule: Stage 2 DBPREnforcement: Informal — resolved cooperativelyVerify on EPA.gov
TIER 2Unresolved
Exceeded the Maximum Contaminant Level (running average)
When: January 1, 2025 – March 31, 2025Rule: Stage 2 DBPREnforcement: Informal — resolved cooperativelyVerify on EPA.gov
TIER 2Unresolved
Exceeded the Maximum Contaminant Level (running average)
When: October 1, 2024 – December 31, 2024Rule: Stage 2 DBPREnforcement: Informal — resolved cooperativelyVerify on EPA.gov
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 PATTERSON WATER SYSTEM
Is PATTERSON WATER SYSTEM water safe to drink?
PATTERSON WATER SYSTEM water receives a grade of D (36/100), which is considered poor. 0 contaminant(s) exceed EPA legal limits and 16 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has PATTERSON WATER SYSTEM detected?
31 contaminants were tested in PATTERSON WATER SYSTEM's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does PATTERSON WATER SYSTEM have any EPA violations?
Yes, PATTERSON WATER SYSTEM has 16 EPA violation(s) on record, with the most recent in 2025. Violation types include MCL, Other, TT. 12 are health-based violations.
How many people does PATTERSON WATER SYSTEM serve?
PATTERSON WATER SYSTEM serves approximately 8,456 people, Louisiana.
What type of water does PATTERSON WATER SYSTEM provide?
PATTERSON WATER SYSTEM sources its water from surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is LA1101006.
How does PATTERSON WATER SYSTEM compare to other utilities in Louisiana?
PATTERSON WATER SYSTEM scores 36/100 with a grade of D (poor). This score suggests significant water quality concerns relative to other utilities. Visit our Louisiana state page for a full comparison of water systems.