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LaSalle Parish Water Report

Drinking-water compliance, watershed health, monitoring records, and river conditions for LaSalle Parish, Louisiana.

Water grade

N/A

Water score

N/A

State rank

N/A

Health violations

N/A

EPA SDWIS, 5-year lookback

Watershed impaired

88.9%

36 water bodies assessed

Monitoring sites

17

3,911 recent measurements

Live streamflow

52%

Little River near Rochelle, LA

Water at a glance

Key Water Indicators for LaSalle Parish

EPA SDWIS

Safety Grade

N/A

Insufficient data

EPA SDWIS

Active Violations

N/A

5-year health-based lookback

EPA ATTAINS

Watershed Health

89% impaired

36 bodies assessed

USGS NWIS

Streamflow Snapshot

52% of mean

Little River near Rochelle, LA

EPA WQP

Monitoring Sites

17

3,911 recent readings

Source: EPA SDWIS · Safe Drinking Water Information System

Drinking Water Compliance

Editorial analysis

Understanding LaSalle Parish’s Water

Drinking Water Quality Overview

EPA SDWIS

LaSalle Parish has limited drinking water data on file. Violation data are unavailable for this county.

Watershed Conditions

EPA ATTAINS

Under the Clean Water Act §303(d), EPA ATTAINS tracks whether waterways meet quality standards for drinking, recreation, and aquatic life (reporting cycle: 2022). A large majority — 88.9% — of assessed waterways are impaired (32 of 36 water bodies) across LaSalle Parish's watersheds. The leading impairment causes are mercury - fish consumption advisory and dissolved oxygen. Impairment does not mean tap water is unsafe — it measures ambient waterway conditions upstream of treatment, not finished drinking water.

River & Streamflow Status

USGS NWIS

USGS NWIS gauge data (as of 2026-05-14T13:30:00.000-05:00) puts Little River at 1.2k cfs — well below its long-term average at 52% of mean — low-flow conditions worth noting for water-dependent ecosystems. Streamflow is a leading indicator of drought stress, sediment load, and dilution capacity: low flows concentrate pollutants and warm water temperatures, stressing aquatic life and, in surface-water-dependent systems, the source water quality for treatment plants.

Monitoring Network

EPA WQP

EPA's Water Quality Portal (WQP) aggregates monitoring data from federal, state, and tribal agencies. LaSalle Parish has moderate coverage with 17 active monitoring sites with 3,911 recent measurements on record. Predominant monitoring categories include physical and organics, other. More monitoring sites generally indicate greater scientific attention to local water conditions — and provide the baseline data that regulators use to set future impairment listings.

Editorial advisory

What the data suggests for LaSalle Parish

Water Verdict

LaSalle Parish does not have sufficient EPA SDWIS water quality data to determine an overall assessment. Residents should contact their local water utility for the most recent Consumer Confidence Report.

Violation Context

Health-based violation data is not available for LaSalle Parish. EPA health violations occur when water systems exceed allowable contaminant levels or fail to meet treatment requirements. Residents should request the latest Consumer Confidence Report from their water provider.

Consumer Guidance

Drinking-water compliance data is not yet available for LaSalle Parish in the EPA SDWIS system, which is common for rural areas and census areas served by private wells or small tribal systems. Residents should contact their local utility or state drinking-water agency for the most current Consumer Confidence Report. Using an NSF-certified filter (look for certifications against ANSI/NSF 53 or 58) can provide additional safety margin for any unconfirmed contaminants. Mercury - Fish Consumption Advisory is the leading impairment cause in LaSalle Parish's watershed. A pipeline streamflow snapshot from the Little River gauge is also available on this page.

Regional Context

State-level water quality comparison data is not available for LaSalle Parish. When data is available, this section will show how the county's water quality compares to other counties in Louisiana.

Advisory text summarizes county-level public records and is not a replacement for your utility's current Consumer Confidence Report or direct local notices.

Contaminants & Resources

Key issues flagged in LaSalle Parish's water environment

Watershed Impairment Causes (EPA ATTAINS)

  • 1

    Mercury - Fish Consumption Advisory

    Impairment cause per EPA Clean Water Act §303(d) assessment

  • 2

    Low dissolved oxygen

    Impairment cause per EPA Clean Water Act §303(d) assessment

  • 3

    Fecal coliform bacteria

    Impairment cause per EPA Clean Water Act §303(d) assessment

Source: EPA ATTAINS · Reporting cycle 2022

Official EPA Resources for LaSalle Parish

EPA How's My Waterway

Interactive watershed health data for LaSalle Parish

EPA ECHO: Drinking Water Systems

Search water utilities and violation records for LaSalle Parish

Consumer Confidence Reports (LA)

Annual water quality reports from utilities in Louisiana

Clean Water Act §303(d)

Watershed Health

Impaired Water Bodies

88.9%

32 of 36 assessed

High concern

Top Impairment Causes

  • 1

    MERCURY - FISH CONSUMPTION ADVISORY

  • 2

    DISSOLVED OXYGEN

  • 3

    FECAL COLIFORM

Source: EPA ATTAINS · Reporting cycle 2022

Impairment is determined under the Clean Water Act §303(d): a water body is impaired when it fails to meet state-defined quality standards for designated uses (drinking, recreation, aquatic life). Assessment coverage varies by state; counties without assessed water bodies are not shown.

Past 5 years

Water Quality Monitoring

Monitoring Sites

17

Active in the past 5 years

Measurements Recorded

3.9K

3,911 total readings

Most Measured

  • Physical
  • Organics, Other
  • Nutrient

Categories measured most frequently

Data from the EPA Water Quality Portal (WQP), aggregating monitoring records from federal, state, and tribal sources. Each measurement represents a single sample analyzed for a specific characteristic (e.g., E. coli, pH, dissolved oxygen, nitrogen).

Live USGS Streamgage

River & Stream Conditions

Current Discharge

1,160cfs

May 14, 6:30 PM UTC

vs Long-Term Average

52%

Well below typical

Primary Streamgage

Little River near Rochelle, LA

USGS site
07372200
Drainage area
1,899 sq mi
Long-term mean
2,222 cfs

One representative streamgage (the one with the largest drainage area in the county). Many counties have multiple gauges; this view summarizes the primary one. The long-term mean is the full-record annual average; the percent-of-typical value compares the latest reading against that average.

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Water Cost Estimate

3

3 people  ·  ~225 gal/day

Annual Total

$558

Monthly

$47

Water Bill

$558/yr

Filter Cost

$0/yr

Safety Grade for LaSalle Parish:F — Failing

High violation count or severe watershed conditions.

Estimates use the national average residential water rate ($0.0068/gal, EPA/AWWA 2023) and EPA WaterSense per-person consumption baseline (75 gal/person/day). Actual bills vary by utility, usage tier, and local infrastructure fees. For informational purposes only.

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LaSalle Parish has good water quality

Learn about water restrictions and conservation in your area.

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Frequently Asked Questions

What is the water quality in LaSalle Parish, Louisiana?
LaSalle Parish, Louisiana has a drinking-water quality grade of N/A with a score of N/A/100, based on EPA SDWIS compliance data. Compliance data is currently unavailable. Watershed health, monitoring records, and streamflow snapshots are reported separately on this page.
Are there any water violations in LaSalle Parish?
Violation data for LaSalle Parish is not currently available. Health-based violations indicate instances where contaminant levels exceeded EPA Maximum Contaminant Levels (MCLs).
How healthy are the watersheds in LaSalle Parish?
EPA ATTAINS assessments under Clean Water Act §303(d) indicate 88.9% of LaSalle Parish's 36 assessed water bodies are classified as impaired (32 impaired). The top reported causes are MERCURY - FISH CONSUMPTION ADVISORY, DISSOLVED OXYGEN, FECAL COLIFORM. Impairment means the water body fails to meet state quality standards for at least one designated use — drinking water source, recreation, aquatic life, or fish consumption. Note: watershed impairment doesn't always translate to tap-water issues; treatment plants can remove most regulated contaminants.
How much water-quality monitoring happens in LaSalle Parish?
EPA's Water Quality Portal records 3,911 measurements from 17 monitoring sites in LaSalle Parish over the past five years. The most frequently measured characteristic groups are Physical, Organics, Other, Nutrient. Each measurement is a single sample analyzed for one characteristic (E. coli, pH, dissolved oxygen, etc.). High monitoring density means more scientific evidence behind any reported signal — it does not by itself indicate water quality.
What's happening with rivers in LaSalle Parish right now?
LaSalle Parish's primary USGS streamgage on the Little River has a pipeline snapshot of 1,160 cubic feet per second — 52% of the long-term mean of 2,221.76 cfs. This is well below typical — often a signal of drought stress on source water. For the latest gauge feed, visit waterdata.usgs.gov.
How does LaSalle Parish water compare to the Louisiana average?
LaSalle Parish's SDWIS water quality score of N/A/100 is not available for comparison. The average water quality grade across Louisiana is F, based on data from 63 counties with available SDWIS data.
Is tap water safe to drink in LaSalle Parish?
Based on EPA SDWIS data, LaSalle Parish has a water quality grade of N/A (N/A/100). Insufficient data is available to fully assess compliance. The grade speaks to the public water system, not the watershed — for watershed-level concerns, see the Watershed Health zone. For the most up-to-date information, contact your local water utility or review your Consumer Confidence Report (CCR).
Does LaSalle Parish have clean drinking water?
LaSalle Parish has no reported health-based drinking water violations according to EPA records. With a water quality score of N/A/100 and grade N/A, the county's drinking water has had some compliance issues but continues to be monitored. Note: drinking-water compliance speaks to the public water system, not necessarily to the watershed itself — check the Watershed Health zone for ATTAINS §303(d) data.
How is water quality measured?
WaterByCounty layers four federal datasets per county. The A–F drinking-water grade comes from EPA SDWIS (Safe Drinking Water Act compliance, 5-year violation lookback). The Watershed Health zone surfaces EPA ATTAINS §303(d) impairment data. The Monitoring zone summarizes EPA Water Quality Portal records. The Streamflow zone reports the latest USGS NWIS reading from the county's primary streamgage. Each is reported separately so you can see where the water is actually weakest.

Data Sources

Drinking-water compliance data from the EPA Safe Drinking Water Information System (SDWIS) via the ECHO enforcement database. Scores reflect compliance history and health-based violation counts.

Watershed health and impaired-waterway data from the EPA ATTAINS Clean Water Act §303(d) assessments, state-reported and EPA-finalized.

Water-quality monitoring counts from the EPA Water Quality Portal (WQP), federated USGS, EPA, and state agency sampling records over a rolling 5-year window.

Live streamflow from the USGS National Water Information System (NWIS), continuous discharge measurements from the largest-drainage gauge in each county, compared against the full-record long-term annual mean.

Disclaimer: This data is informational only. It is not health, legal, or professional advice. For concerns about your specific water supply, contact your local water utility.

By Evan Brooks, Data EditorUpdated Reviewed by Evan Brooks, Data Editor

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