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Official EPA SDWIS Verified ReportWater Quality & Testing GuideHistorical Record: No Recorded SDWIS Violations

ZIP Code 70721 Water Quality & Testing Report

Carville, LA · Iberville Parish County · Updated for 2026

Sahajul HaqueCompiled & verified by Sahajul Haque from official EPA SDWIS records
Public Health & Medical Notice: Drinking water quality data on this page reflects historical compliance records submitted under the Safe Drinking Water Act. This information does not constitute medical advice or a real-time safety guarantee. If you are pregnant, nursing, preparing infant formula, or immunocompromised, consult a healthcare provider. Boiling water kills biological pathogens, but does NOT remove chemical contaminants like lead, arsenic, or PFAS.
Quick EPA Verified Answer

Is Tap Water Safe to Drink in ZIP 70721 (Carville, LA)?

Caution / Filtration Recommended: Tap water in ZIP code 70721 (Carville, LA) has compliance concerns, earning an EPA Safety Grade of C (69/100) due to 1 health violation(s) and 18.0 ppb lead. While treated by Intracoastal Water System East, residents are advised to use an NSF/ANSI 53 certified water filter for drinking and cooking.

Safety Score
C

Water Safety Grade

Fair — Some compliance concerns

Health Violations

1

Total Violations

3

Lead Risk

Moderate

Contaminants

1

About Tap Water in ZIP Code 70721

Tap water in ZIP code 70721 (Carville, LA) is distributed by Intracoastal Water System East (EPA ID: LA1047030), serving approximately 2,940 residents. Based on EPA Safe Drinking Water Act compliance records, this system receives a water safety grade of C with a composite quality score of 69/100.

Water System

Intracoastal Water System East

EPA ID: LA1047030

Water Source

Ground Water

Population Served

2,940 residents

County

Iberville Parish County, Louisiana

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Lead Levels in ZIP 70721

EPA action level: 15 ppb | Public health goal: 0 ppb

Lead Level: 18.0 ppb — EXCEEDS EPA Action Level

The 90th percentile lead level in 70721 is 18.0 ppb, which EXCEEDS the EPA action level of 15 ppb. Immediate action is recommended. Use a certified NSF/ANSI 53 filter or bottled water for drinking and cooking.

Lead exposure risk in 70721 is rated Moderate. EPA models estimate a 38% exposure probability based on housing and infrastructure age.

Lead Level (90th percentile)
18.00 ppb (0.018 mg/L)
Lead Exposure Risk Rating
Moderate
Lead Exposure Probability

EPA model estimate based on housing age and infrastructure

38%
Note: Lead levels above are the 90th percentile from EPA monitoring — meaning 90% of samples were at or below this level. Even "undetected" tap water lead doesn't account for lead leaching from home plumbing. If your home was built before 1986, individual tap testing is recommended.
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Water Hardness & Mineral Content

Grains per gallon (GPG) & Parts per million (PPM / mg/L)

Classification: Moderately Hard5.2 GPG · 89 mg/L

Water in ZIP 70721 is Moderately Hard (89 mg/L / 5.2 GPG). It contains beneficial natural minerals like calcium and magnesium without causing heavy scale accumulation.

Recommendation: A water softener is optional. Regular maintenance of hot water appliances is recommended.
Hardness (GPG)

Grains per gallon

5.2 GPG
Hardness (PPM / mg/L)

Parts per million CaCO3

89 mg/L
Appliance Scaling Risk
Low / Moderate

Interactive Water Safety & Filter Matcher

Personalized for ZIP 70721 (Carville, LA)

Free Tool

Official EPA SDWIS Database Entry

Utility: Intracoastal Water System East · PWSID: LA1047030

Verify on EPA.gov
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Violation History

Past 5 years — EPA SDWIS data

Intracoastal Water System East has recorded 1 health-based violation out of 3 total violations over the past 5 years.

Total Violations (5 yr)
3
Health-Based Violations
1
Unresolved Violations
0
Boil Water Advisories
0
Compliance Risk
High

Regulatory compliance risk for this utility is rated High based on past reporting and enforcement records.

⚗️

Contaminants Detected

Contaminants with health-based violations on record

EPA records identify 1 contaminant with health-based violations in the past 5 years: Stage 1 DBP Rule.

Stage 1 DBP Rule

⚖ Enforcement Actions

EPA or state regulators have issued 6 enforcement actions to address compliance lapses.
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Water Source & Environmental Factors

Ground Water

This system draws water from underground aquifers. Groundwater is naturally filtered through soil and rock, but can still contain naturally occurring minerals like arsenic, radium, or nitrates.

Water Source Type
Ground Water
EPA Radon Zone

Lower potential

Zone 3
Annual Flood Risk Cost

Estimated annual flood-related costs per property

$3
Energy Burden

% of household income spent on energy — indicator of older infrastructure

66.68%

EPA Radon Zone 3 — lower radon potential, though the EPA still recommends testing all homes.

Water Quality Testing in ZIP 70721

Tap Water & Well Testing Recommendations

Residents in ZIP code 70721 served by Intracoastal Water System East can test tap water or private well systems to verify water purity. Testing detects hidden contaminants before they impact family health.

Tap Water Testing Steps

  • 1.Conduct a certified lead check if your home was constructed before 1986.
  • 2.Use certified lab testing kits rather than uncalibrated test strips for regulated compliance.
  • 3.Sample water from both your kitchen faucet and water heater to compare line purity.

Private Well Testing Steps

  • •Test for Coliform bacteria and Nitrates annually.
  • •Test for heavy metals, radon, and PFAS every 3 years.
  • •Send samples to a state-certified drinking water laboratory recognized by Louisiana Department of Health.
Certified Lab Testing: Always use an EPA-certified drinking water laboratory in LA for formal legal or real estate compliance testing.

🛡 What Should You Do? — ZIP 70721 Recommendations

  • ⚠ Use a certified NSF/ANSI 53 filter for drinking and cooking water if you have young children
  • ⚠ Never give unfiltered tap water to infants in formula — use certified bottled or filtered water
  • ⚠ Request a copy of the Consumer Confidence Report to see what was detected and when
  • ⚠ Call the EPA Safe Drinking Water Hotline: 1-800-426-4791

Recommended Water Treatment Systems:

🏺

NSF 53 Lead Pitcher Filter

Specifically certified to reduce lead and copper at the tap.

Lead Filter Guide →
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NSF 58 Under-Sink RO System

Advanced filtration for PFAS, fluoride, nitrates, and organic chemicals.

RO System Guide →

Frequently Asked Questions — ZIP 70721 Water Quality

Is tap water safe to drink in ZIP code 70721?+
Tap water in 70721 (Carville, LA) meets major standards but has a grade of C due to minor past violations. Vulnerable populations may want to use a certified filter as a precaution.
How do I get my water tested in ZIP 70721 (Carville, LA)?+
To test water quality in ZIP 70721, you can order a certified drinking water test kit or send water samples to an EPA/NELAP certified laboratory in LA. Certified testing checks for lead, coliform bacteria, nitrates, hardness, and PFAS that standard test strips miss. Contact Louisiana Department of Health for a list of certified regional labs.
How hard is the tap water in 70721?+
Tap water in 70721 is classified as Moderately Hard with an estimated mineral hardness of 89 mg/L (5.2 GPG). A water softener is optional. Regular maintenance of hot water appliances is recommended.
Should I test private well water in 70721?+
Yes. Unlike municipal systems, private wells in 70721 are not regulated by the EPA or local utilities. Private well owners should test their water annually for coliform bacteria and nitrates, and every 3 to 5 years for heavy metals (lead, arsenic) and volatile organic compounds.
What is the lead level in 70721 tap water?+
The 90th percentile lead level in 70721 is 18.0 ppb. The EPA action level is 15 ppb. This exceeds the action level — a certified lead-reducing filter is recommended.
Is there an active boil water notice in 70721?+
There are currently no active boil water advisories on record for 70721. Water treatment systems are operating within normal parameters.
Who provides tap water to 70721?+
Tap water in ZIP code 70721 is provided by Intracoastal Water System East (EPA ID: LA1047030), serving approximately 2,940 residents.
What water filter should I use in 70721?+
Based on water metrics for 70721, we recommend Reverse Osmosis (PFAS & Lead). Look for certifications such as NSF/ANSI 58 (Reverse Osmosis), NSF/ANSI 53 (Lead & VOCs), NSF/ANSI P473 (PFAS/PFOS).

Data Sources & Methodology

Water quality data for ZIP code 70721 is compiled from the EPA Safe Drinking Water Information System (SDWIS), EPA ECHO enforcement database, UCMR5 unregulated contaminant monitoring, and Consumer Confidence Reports filed by Intracoastal Water System East. Safety scores are composite metrics derived from violation history, lead levels, enforcement actions, and infrastructure risk indicators. Data reflects a 5-year monitoring window. Last dataset update: 2024. View EPA source data →