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Federal water data

County water report

Lafayette Parish Water Report

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

Water grade

F

Water score

41.1

State rank

#17

of 63

Health violations

92

EPA SDWIS, 5-year lookback

Watershed impaired

94.0%

83 water bodies assessed

Monitoring sites

53

9,704 recent measurements

Live streamflow

53%

Vermillion Rvr N. of I-10 at Lafayette, La

Water at a glance

Key Water Indicators for Lafayette Parish

EPA SDWIS

Safety Grade

F

Score: 41.1 / 100

EPA SDWIS

Active Violations

92

5-year health-based lookback

EPA ATTAINS

Watershed Health

94% impaired

83 bodies assessed

USGS NWIS

Streamflow Snapshot

53% of mean

Vermillion Rvr N. of I-10 at Lafayette, La

EPA WQP

Monitoring Sites

53

9,704 recent readings

Source: EPA SDWIS · Safe Drinking Water Information System

Drinking Water Compliance

Compliance grade

F

Based on EPA SDWIS compliance history.

Water score

Higher scores indicate cleaner recent compliance records.

41.1/100

Health violations

92

Health-based violations

Violations per 100K served

30.4

Population-normalized SDWIS rate

Editorial analysis

Understanding Lafayette Parish’s Water

Drinking Water Quality Overview

EPA SDWIS

Lafayette Parish's water systems carry a failing grade, scoring 41.1 out of 100. Over the past five years, EPA SDWIS records 92 health-based violations — a pattern that public water utilities are required to disclose and correct.

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 — 94.0% — of assessed waterways are impaired (78 of 83 water bodies) across Lafayette Parish's watersheds. The leading impairment causes are dissolved oxygen and fecal coliform. 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 2024-10-25T00:45:00.000-05:00) puts Vermillion Rvr N. of I-10 at 197.0 cfs — well below its long-term average at 53% 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. Lafayette Parish has extensive coverage with 53 active monitoring sites with 9,704 recent measurements on record. Predominant monitoring categories include nutrient and physical. 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 Lafayette Parish

Water Verdict

Lafayette Parish receives a below-average water quality assessment with a grade of F and a score of 41.1 out of 100. Residents should review their utility's Consumer Confidence Report and may want to consider additional water filtration for drinking.

Violation Context

Lafayette Parish has recorded 92 health-based violations, indicating multiple instances where federal contaminant limits or treatment requirements were not met. At 30.4 violations per 100,000 people served, this rate is high and signals significant water quality management issues.

Consumer Guidance

Lafayette Parish has a Grade F compliance record with 92 health-based violations — among the highest levels in the country. Lafayette Parish's drinking-water compliance score is 41.1 out of 100. The violation rate for Lafayette Parish is 30.4 per 100,000 people served. Residents are strongly advised to use a certified NSF 58 reverse-osmosis filter or bottled water for all drinking and cooking until violations are corrected. Contacting the Louisiana Department of Environmental Quality or Health can expedite utility compliance action. Dissolved Oxygen is the leading impairment cause in Lafayette Parish's watershed. With 53 active water-quality monitoring sites in Lafayette Parish, data coverage is strong. Live streamflow monitoring from the Vermillion Rvr N. of I-10 gauge is also available on this page.

Regional Context

Lafayette Parish has better water quality than the average county in Louisiana. Its water score is 11 points higher than the state average, indicating stronger water system performance relative to neighboring counties.

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 Lafayette Parish's water environment

Watershed Impairment Causes (EPA ATTAINS)

  • 1

    Low dissolved oxygen

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

  • 2

    Fecal coliform bacteria

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

  • 3

    High turbidity

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

Source: EPA ATTAINS · Reporting cycle 2022

Official EPA Resources for Lafayette Parish

EPA How's My Waterway

Interactive watershed health data for Lafayette Parish

EPA ECHO: Drinking Water Systems

Search water utilities and violation records for Lafayette Parish

Consumer Confidence Reports (LA)

Annual water quality reports from utilities in Louisiana

Clean Water Act §303(d)

Watershed Health

Impaired Water Bodies

94.0%

78 of 83 assessed

High concern

Top Impairment Causes

  • 1

    DISSOLVED OXYGEN

  • 2

    FECAL COLIFORM

  • 3

    TURBIDITY

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

53

Active in the past 5 years

Measurements Recorded

9.7K

9,704 total readings

Most Measured

  • Nutrient
  • Physical
  • Organics, Other

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

197cfs

Oct 25, 5:45 AM UTC

vs Long-Term Average

53%

Well below typical

Primary Streamgage

Vermillion Rvr N. of I-10 at Lafayette, La

USGS site
07386655
Long-term mean
374 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.

Free tool

Estimate Your Water Costs

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 Lafayette Parish:D — Poor

Elevated violations or significant watershed impairment.

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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Frequently Asked Questions

What is the water quality in Lafayette Parish, Louisiana?
Lafayette Parish, Louisiana has a drinking-water quality grade of F with a score of 41.1/100, based on EPA SDWIS compliance data. The county has 92 health-based drinking water violations over the past 5 years. Watershed health, monitoring records, and streamflow snapshots are reported separately on this page.
Are there any water violations in Lafayette Parish?
Lafayette Parish has 92 health-based drinking water violations recorded by the EPA over the past 5 years. Health-based violations indicate instances where contaminant levels exceeded EPA Maximum Contaminant Levels (MCLs). Violations may have been resolved — check with your local water utility for current status.
How healthy are the watersheds in Lafayette Parish?
EPA ATTAINS assessments under Clean Water Act §303(d) indicate 94.0% of Lafayette Parish's 83 assessed water bodies are classified as impaired (78 impaired). The top reported causes are DISSOLVED OXYGEN, FECAL COLIFORM, TURBIDITY. 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 Lafayette Parish?
EPA's Water Quality Portal records 9,704 measurements from 53 monitoring sites in Lafayette Parish over the past five years. The most frequently measured characteristic groups are Nutrient, Physical, Organics, Other. 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 Lafayette Parish right now?
Lafayette Parish's primary USGS streamgage on the Vermillion Rvr N. of I-10 has a pipeline snapshot of 197 cubic feet per second — 53% of the long-term mean of 374.1 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 Lafayette Parish water compare to the Louisiana average?
Lafayette Parish's SDWIS water quality score of 41.1/100 is higher than the Louisiana state average of 30.1. 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 Lafayette Parish?
Based on EPA SDWIS data, Lafayette Parish has a water quality grade of F (41.1/100). This indicates below-average compliance with significant violations. Residents may want to consider home water filtration or independent testing. 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).
Why does Lafayette Parish have so many water violations?
Lafayette Parish has 92 health-based drinking water violations on record from the EPA SDWIS database. A higher violation count can result from aging infrastructure, underfunded water utilities, agricultural runoff contamination, or industrial pollution. Counties with more water systems may also see more violations simply due to scale. Residents concerned about water quality should consider independent water testing and home filtration systems.
How does Lafayette Parish rank for water quality in Louisiana?
Lafayette Parish ranks #17 out of 63 counties in Louisiana by SDWIS water quality score (1 = best). With a score of 41.1/100, it falls in the top third of counties statewide. The ranking reflects EPA SDWIS compliance only — not watershed impairment, monitoring density, or streamflow, which are tracked separately on this page.

Counties with Similar Water Quality

Livingston Parish

Louisiana

F

40.6

Water score

Pointe Coupee Parish

Louisiana

F

40.0

Water score

Calcasieu Parish

Louisiana

D

43.6

Water score

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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