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County water report

St. John the Baptist Parish Water Report

Drinking-water compliance, watershed health, monitoring records, and river conditions for St. John the Baptist Parish, Louisiana.

Water grade

A

Water score

86.0

State rank

#5

of 63

Health violations

0

EPA SDWIS, 5-year lookback

Watershed impaired

74.4%

43 water bodies assessed

Monitoring sites

24

3,257 recent measurements

Live streamflow

No gauge

Primary USGS station not mapped

Water at a glance

Key Water Indicators for St. John the Baptist Parish

EPA SDWIS

Safety Grade

A

Score: 86.0 / 100

EPA SDWIS

Active Violations

0

5-year health-based lookback

EPA ATTAINS

Watershed Health

74% impaired

43 bodies assessed

USGS NWIS

Streamflow Snapshot

No gauge

Primary USGS gauge not mapped

EPA WQP

Monitoring Sites

24

3,257 recent readings

Source: EPA SDWIS · Safe Drinking Water Information System

Drinking Water Compliance

Compliance grade

A

Based on EPA SDWIS compliance history.

Water score

Higher scores indicate cleaner recent compliance records.

86.0/100

Health violations

0

Health-based violations

Violations per 100K served

0.0

Population-normalized SDWIS rate

Editorial analysis

Understanding St. John the Baptist Parish’s Water

Drinking Water Quality Overview

EPA SDWIS

St. John the Baptist Parish earns an A grade for drinking water quality, scoring 86.0 out of 100. EPA's Safe Drinking Water Information System (SDWIS) records zero health-based violations over the past five years — a strong compliance signal for a mid-sized 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 — 74.4% — of assessed waterways are impaired (32 of 43 water bodies) across St. John the Baptist Parish's watersheds. The leading impairment causes are non-native aquatic plants and dissolved oxygen. Impairment does not mean tap water is unsafe — it measures ambient waterway conditions upstream of treatment, not finished drinking water.

Monitoring Network

EPA WQP

EPA's Water Quality Portal (WQP) aggregates monitoring data from federal, state, and tribal agencies. St. John the Baptist Parish has moderate coverage with 24 active monitoring sites with 3,257 recent measurements on record. Predominant monitoring categories include physical and biological, algae, cyanobacteria. 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 St. John the Baptist Parish

Water Verdict

St. John the Baptist Parish, Louisiana receives an excellent water quality assessment with a grade of A and a score of 86.0 out of 100. The water supply meets or exceeds federal safety standards, and residents can generally drink tap water with confidence. Separately, EPA ATTAINS assessments cover 43 water bodies in the county's watershed, with 74.4% listed as impaired under the Clean Water Act — a source-water measure that is tracked independently of tap-water compliance.

Violation Context

EPA SDWIS records for St. John the Baptist Parish, Louisiana show zero health-based violations, indicating that the county's water systems met all federal safety standards during the reporting period. The violation rate is zero per 100,000 people served, which is the best possible outcome. For independent context, 3,257 water-quality monitoring results have been recorded across the county in the EPA Water Quality Portal over the past five years.

Consumer Guidance

Tap water in St. John the Baptist Parish is safe to drink based on current EPA compliance records. No health-based violations have been recorded, placing St. John the Baptist Parish in the top tier for drinking-water safety. St. John the Baptist Parish's drinking-water compliance score is 86.0 out of 100. As a routine precaution, requesting your utility's annual Consumer Confidence Report each July gives you a full list of detected contaminants and their treatment levels. With 24 active water-quality monitoring sites in St. John the Baptist Parish, data coverage is strong.

Regional Context

St. John the Baptist Parish has better water quality than the average county in Louisiana. Its water score is 55.9 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 St. John the Baptist Parish's water environment

Watershed Impairment Causes (EPA ATTAINS)

  • 1

    Non-Native Aquatic Plants

    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

    High turbidity

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

Source: EPA ATTAINS · Reporting cycle 2022

Official EPA Resources for St. John the Baptist Parish

EPA How's My Waterway

Interactive watershed health data for St. John the Baptist Parish

EPA ECHO: Drinking Water Systems

Search water utilities and violation records for St. John the Baptist Parish

Consumer Confidence Reports (LA)

Annual water quality reports from utilities in Louisiana

Clean Water Act §303(d)

Watershed Health

Impaired Water Bodies

74.4%

32 of 43 assessed

High concern

Top Impairment Causes

  • 1

    NON-NATIVE AQUATIC PLANTS

  • 2

    DISSOLVED OXYGEN

  • 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

24

Active in the past 5 years

Measurements Recorded

3.3K

3,257 total readings

Most Measured

  • Physical
  • Biological, Algae, Cyanobacteria
  • 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).

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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 St. John the Baptist Parish:C — Moderate

Some violations or watershed impairment detected.

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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St. John the Baptist Parish has good water quality

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Frequently Asked Questions

What is the water quality in St. John the Baptist Parish, Louisiana?
St. John the Baptist Parish, Louisiana has a drinking-water quality grade of A with a score of 86.0/100, based on EPA SDWIS compliance data. The county has 0 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 St. John the Baptist Parish?
St. John the Baptist Parish has 0 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). Zero violations is an excellent record indicating consistent compliance with federal drinking water standards.
How healthy are the watersheds in St. John the Baptist Parish?
EPA ATTAINS assessments under Clean Water Act §303(d) indicate 74.4% of St. John the Baptist Parish's 43 assessed water bodies are classified as impaired (32 impaired). The top reported causes are NON-NATIVE AQUATIC PLANTS, DISSOLVED OXYGEN, 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 St. John the Baptist Parish?
EPA's Water Quality Portal records 3,257 measurements from 24 monitoring sites in St. John the Baptist Parish over the past five years. The most frequently measured characteristic groups are Physical, Biological, Algae, Cyanobacteria, 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.
How does St. John the Baptist Parish water compare to the Louisiana average?
St. John the Baptist Parish's SDWIS water quality score of 86.0/100 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 St. John the Baptist Parish?
Based on EPA SDWIS data, St. John the Baptist Parish has a water quality grade of A (86.0/100). This indicates good to excellent water quality with strong SDWIS 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 St. John the Baptist Parish have clean drinking water?
St. John the Baptist Parish has 0 health-based drinking water violations according to EPA records. With a water quality score of 86.0/100 and grade A, the county's drinking water meets EPA standards with no recorded health violations. 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 does St. John the Baptist Parish rank for water quality in Louisiana?
St. John the Baptist Parish ranks #5 out of 63 counties in Louisiana by SDWIS water quality score (1 = best). With a score of 86.0/100, 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

Assumption Parish

Louisiana

A

86.0

Water score

Lafourche Parish

Louisiana

A

86.0

Water score

St. Bernard Parish

Louisiana

A

86.0

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.

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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