A
89

US Water Score: A

Slidell, LA 70460

Saint Tammany County · Population served: 35,547 · Data updated July 2026

Service-area evidence: EPA service-area records associate the listed system with this ZIP. Boundaries may still overlap or change.

Water Systems Serving This Area

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SLIDELL WATER SUPPLY
Groundwater · Pop. 35,547
PWSID: LA1103041
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BAYOU LIBERTY WATER ASSOCIATION
Groundwater · Pop. 10,791
PWSID: LA1103005
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ST TAM PARISH - CROSS GATES SD
Groundwater · Pop. 8,037
PWSID: LA1103053
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MAGNOLIA-THE MEADOWS
Groundwater · Pop. 4,701
PWSID: LA1103106
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CREEK PLACE APARTMENTS
Groundwater · Pop. 100
PWSID: LA1103081

Contaminants Detected

ContaminantDetected LevelEPA MCLHealth GuidelineStatus
Lead
1.0
15 ppb 1 ppb Passed
Copper
9800.0
1300 ppb 300 ppb

PFAS / Forever Chemicals

1 detected Below comparison values

UCMR5 occurrence results are screening information, not a finding of regulatory compliance or noncompliance. PFAS rules and compliance dates are evolving.

CompoundLevelEPA MCLHealth GuidelineStatus
6:2 FTS8.2 pptNo standardNo federal MCL shown

Violation History (Last 5 Years)

16Total (5yr)
7Health-Based
0Major

Water Quality Summary

Understanding Your Water in Slidell

Tap water quality in Slidell, Louisiana (70460) receives an overall grade of A (Lower record-based concern) with a score of 89 out of 100, based on analysis of EPA compliance data, contaminant testing, and violation history. This is roughly in line with the Louisiana state average of 89. Compared to the national average (75), this area performs significantly better. The area is served by 6 water systems providing water to approximately 35,547 people, using groundwater sources. PFAS testing detected 1 compound, all below the EPA final MCL values used for comparison. Over the past 5 years, water systems here have accumulated 16 violations, including 7 health-based violations.

Your Score 89/100 A
vs State 0 pts below Louisiana avg (89)
vs National 14 pts above national avg (75)

What a Grade A Means

A score of 89/100 means public water-system records for Slidell, LA show relatively few concerns in the US Water Score model. This is an internal score, not an EPA safety rating, and it does not guarantee conditions at any specific tap.

Groundwater: drawn from underground aquifers via wells

Health Information

What These Contaminants Mean for You

⚠️

Lead in Your Water

Lead is a toxic metal that can leach from aging pipes and plumbing fixtures.

Health Effects

Even low levels of lead exposure can cause developmental delays in children, kidney damage, and cardiovascular effects in adults. The EPA action level is 15 ppb, but health experts recommend no safe level of lead in drinking water.

Common Sources

Lead enters water primarily through corrosion of lead service lines, lead solder, and brass fixtures — especially in homes built before 1986.

What You Can Do

If lead is detected above 1 ppb, consider using a certified lead-removal filter (NSF/ANSI 53) for drinking and cooking water. Run cold water for 30 seconds before use if water has been sitting in pipes.

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Copper in Your Water

Copper can leach into water from copper plumbing, especially in newer homes or when water is acidic.

Health Effects

Short-term exposure above 1,300 ppb can cause gastrointestinal distress. Long-term exposure may cause liver or kidney damage. People with Wilson's disease are especially vulnerable.

Common Sources

Copper pipes, fittings, and faucets are the most common source. Corrosive (low-pH) water accelerates copper leaching.

What You Can Do

If copper levels are elevated, flush pipes by running water for 15–30 seconds before use. Reverse osmosis and distillation systems effectively remove copper.

Common Questions

Frequently Asked Questions

Based on public water-system records, Slidell, Louisiana receives an internal US Water Score grade of A (Lower record-based concern) with a score of 89/100. This indicates relatively few system-level concerns in our model, but it is not an EPA safety rating and does not guarantee tap conditions inside individual homes.

ZIP code 70460 is served by 6 water systems using groundwater sources, providing water to approximately 35,547 people. Groundwater is naturally filtered through rock and soil, often requiring less treatment. However, it can be vulnerable to contamination from underground sources like naturally occurring arsenic, nitrates from agriculture, or PFAS from industrial sites.

Lead levels in Slidell, Louisiana are 1.0 ppb, which is at or below the health guideline of 1 ppb. This is a positive result, though periodic testing is still recommended.

1 PFAS compound were detected in water serving Slidell, Louisiana, with reported values below the EPA final MCL values used by this site. This comparison is informational: federal compliance timelines and the status of some PFAS standards are still evolving. Activated carbon or reverse osmosis filters can reduce some PFAS when appropriately certified and maintained.

Water systems serving Slidell, Louisiana have received 16 violations in the last 5 years, including 7 health-based violations. Violations can range from paperwork issues (monitoring & reporting) to serious health-based violations where contaminant levels exceeded safe limits. Review the violation details above for specifics.

Based on detected contaminants (PFAS, copper), residents in Slidell, Louisiana should consider: Reverse osmosis (RO) system — most effective for PFAS, lead, and other contaminants. Always look for filters with NSF/ANSI certification for the specific contaminants you want to remove.

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