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Tangipahoa Parish Water Report

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

Water grade

F

Water score

35.4

State rank

#22

of 63

Health violations

58

EPA SDWIS, 5-year lookback

Watershed impaired

81.3%

160 water bodies assessed

Monitoring sites

27

8,155 recent measurements

Live streamflow

224%

Tangipahoa River at Robert, LA

Water at a glance

Key Water Indicators for Tangipahoa Parish

EPA SDWIS

Safety Grade

F

Score: 35.4 / 100

EPA SDWIS

Active Violations

58

5-year health-based lookback

EPA ATTAINS

Watershed Health

81% impaired

160 bodies assessed

USGS NWIS

Streamflow Snapshot

224% of mean

Tangipahoa River at Robert, LA

EPA WQP

Monitoring Sites

27

8,155 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.

35.4/100

Health violations

58

Health-based violations

Violations per 100K served

45.4

Population-normalized SDWIS rate

Editorial analysis

Understanding Tangipahoa Parish’s Water

Drinking Water Quality Overview

EPA SDWIS

Tangipahoa Parish's water systems carry a failing grade, scoring 35.4 out of 100. Over the past five years, EPA SDWIS records 58 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 — 81.3% — of assessed waterways are impaired (130 of 160 water bodies) across Tangipahoa Parish's watersheds. The leading impairment causes are dissolved oxygen and mercury - fish consumption advisory. 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 2026-05-14T13:45:00.000-05:00) puts Tangipahoa River at 2.6k cfs — running significantly above its long-term average at 224% of mean flow. 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. Tangipahoa Parish has moderate coverage with 27 active monitoring sites with 8,155 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 Tangipahoa Parish

Water Verdict

Tangipahoa Parish, Louisiana receives a poor water quality assessment with a grade of F and a score of 35.4 out of 100. The water supply has documented quality issues. Residents are strongly encouraged to use filtered or bottled water for drinking and to stay informed about utility improvement plans. Separately, EPA ATTAINS assessments cover 160 water bodies in the county's watershed, with 81.3% listed as impaired under the Clean Water Act — a source-water measure that is tracked independently of tap-water compliance. At the most recent USGS reading, local streamflow was running above its historical mean at 223.8%.

Violation Context

EPA SDWIS records for Tangipahoa Parish, Louisiana show 58 health-based violations, indicating multiple instances where federal contaminant limits or treatment requirements were not met. At 45.4 violations per 100,000 people served, this rate is high and signals significant water quality management issues. For independent context, 8,155 water-quality monitoring results have been recorded across the county in the EPA Water Quality Portal over the past five years.

Consumer Guidance

Tangipahoa Parish has a Grade F compliance record with 58 health-based violations — among the highest levels in the country. Tangipahoa Parish's drinking-water compliance score is 35.4 out of 100. The violation rate for Tangipahoa Parish is 45.4 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 Tangipahoa Parish's watershed. With 27 active water-quality monitoring sites in Tangipahoa Parish, data coverage is strong. A pipeline streamflow snapshot from the Tangipahoa River gauge is also available on this page.

Regional Context

Tangipahoa Parish has better water quality than the average county in Louisiana. Its water score is 5.3 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 Tangipahoa Parish's water environment

Watershed Impairment Causes (EPA ATTAINS)

  • 1

    Low dissolved oxygen

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

  • 2

    Mercury - Fish Consumption Advisory

    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 Tangipahoa Parish

EPA How's My Waterway

Interactive watershed health data for Tangipahoa Parish

EPA ECHO: Drinking Water Systems

Search water utilities and violation records for Tangipahoa Parish

Consumer Confidence Reports (LA)

Annual water quality reports from utilities in Louisiana

Clean Water Act §303(d)

Watershed Health

Impaired Water Bodies

81.3%

130 of 160 assessed

High concern

Top Impairment Causes

  • 1

    DISSOLVED OXYGEN

  • 2

    MERCURY - FISH CONSUMPTION ADVISORY

  • 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

27

Active in the past 5 years

Measurements Recorded

8.2K

8,155 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

2,600cfs

May 14, 6:45 PM UTC

vs Long-Term Average

224%

Well above typical

Primary Streamgage

Tangipahoa River at Robert, LA

USGS site
07375500
Drainage area
646 sq mi
Long-term mean
1,162 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 Tangipahoa 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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Frequently Asked Questions

What is the water quality in Tangipahoa Parish, Louisiana?
Tangipahoa Parish, Louisiana has a drinking-water quality grade of F with a score of 35.4/100, based on EPA SDWIS compliance data. The county has 58 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 Tangipahoa Parish?
Tangipahoa Parish has 58 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 Tangipahoa Parish?
EPA ATTAINS assessments under Clean Water Act §303(d) indicate 81.3% of Tangipahoa Parish's 160 assessed water bodies are classified as impaired (130 impaired). The top reported causes are DISSOLVED OXYGEN, MERCURY - FISH CONSUMPTION ADVISORY, 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 Tangipahoa Parish?
EPA's Water Quality Portal records 8,155 measurements from 27 monitoring sites in Tangipahoa 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 Tangipahoa Parish right now?
Tangipahoa Parish's primary USGS streamgage on the Tangipahoa River has a pipeline snapshot of 2,600 cubic feet per second — 224% of the long-term mean of 1,161.84 cfs. This is well above typical — often a signal of recent precipitation or storm runoff. For the latest gauge feed, visit waterdata.usgs.gov.
How does Tangipahoa Parish water compare to the Louisiana average?
Tangipahoa Parish's SDWIS water quality score of 35.4/100 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 Tangipahoa Parish?
Based on EPA SDWIS data, Tangipahoa Parish has a water quality grade of F (35.4/100). 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 Tangipahoa Parish have so many water violations?
Tangipahoa Parish has 58 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 Tangipahoa Parish rank for water quality in Louisiana?
Tangipahoa Parish ranks #22 out of 63 counties in Louisiana by SDWIS water quality score (1 = best). With a score of 35.4/100, it falls in the middle 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

Vernon Parish

Louisiana

F

36.3

Water score

St. Tammany Parish

Louisiana

F

36.4

Water score

Iberia Parish

Louisiana

F

33.5

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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