Calcasieu County, Louisiana
19 ZIP codes · Avg score 84/100 · Grade B · Updated 2026-06-04
Unlike many counties its size, Calcasieu County keeps violation rates low — all 19 ZIP codes score at or above the state average for tap water safety, with no systemic concerns flagged in the current data set.
How Calcasieu County Compares
How Calcasieu County Compares
Calcasieu County scores 13 points above the Louisiana state average (71/100) and 16 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-04
ZIP Code Risk Map
Water Quality Map: Calcasieu County, Louisiana
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 14.9 (asthma 10.2%, diabetes 14.2%)
Estimated additional annual cost per homeowner: $5,265, driven primarily by sea_level
Infrastructure: 0.337% avg pipe failure probability, 11% of ZIPs at high risk
46% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
↑ Worsening trendEPA violation counts by year across Calcasieu County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 41 violations. Past 5 years: 93 total (93 health-based). Health-based violations are rising versus the prior 2-year window — worth closer monitoring.
Source: EPA SDWIS historical violations. Data may lag 6–12 months for the most recent year.
County Health Indicators vs National Average
Black markers indicate national averages. Source: CDC PLACES, Census ACS.
Infrastructure Overview
Sources: Census ACS (housing age), EPA SDWIS (infrastructure risk model), state bridge inspection data.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $5,265
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
96,395 housing units in Calcasieu County
Source: U.S. Census Bureau ACS B25034 (Year Structure Built).
Water Safety Affordability
How much it costs to fix water issues relative to home values in Calcasieu County
Remediation costs are relatively manageable for most homeowners in Calcasieu County, representing a small fraction of property value.
Remediation includes water filtration, lead abatement, radon mitigation, and flood protection where applicable. Source: Census ACS, EPA SDWIS.
Health Outcomes vs National Average
CDC PLACES data for Calcasieu County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water Systems with Most Violations
Top 5 systems in Calcasieu County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Houston River Waterworks District 11 | 6,915 | 14 |
| 2 | Calcasieu Parish Ww District 9 Carlyss | 14,502 | 14 |
| 3 | Jeff Davis Water and Sewer Commission 1 | 9,780 | 11 |
| 4 | Sulphur City of Water System | 24,489 | 10 |
| 5 | Calcasieu Parish Ww District No 4 | 5,340 | 9 |
20 total water systems serve Calcasieu County.
All ZIP Codes in Calcasieu County
19 ZIP codes tracked in Calcasieu County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 70609 | Lake Charles | 99 | A | 0 | — |
| 2 | 70606 | Lake Charles | 95 | A | 0 | — |
| 3 | 70612 | Lake Charles | 95 | A | 0 | — |
| 4 | 70616 | Lake Charles | 95 | A | 0 | — |
| 5 | 70629 | Lake Charles | 95 | A | 0 | — |
| 6 | 70664 | Sulphur | 94 | A | 1 (1 health) | — |
| 7 | 70602 | Lake Charles | 90 | A | 0 | — |
| 8 | 70633 | Dequincy | 90 | A | 0 | $195K |
| 9 | 70668 | Vinton | 82 | B | 4 | $142K |
| 10 | 70611 | Lake Charles | 80 | B | 0 | $249K |
| 11 | 70615 | Lake Charles | 80 | B | 0 | $129K |
| 12 | 70663 | Sulphur | 79 | B | 1 (1 health) | $174K |
| 13 | 70665 | Sulphur | 79 | B | 1 (1 health) | $230K |
| 14 | 70647 | Iowa | 76 | B | 5 (1 health) | $251K |
| 15 | 70601 | Lake Charles | 75 | B | 0 | $164K |
| 16 | 70605 | Lake Charles | 75 | B | 0 | $294K |
| 17 | 70607 | Lake Charles | 75 | B | 0 | $172K |
| 18 | 70669 | Westlake | 71 | B | 7 (3 health) | $161K |
| 19 | 70630 | Bell City | 66 | C | 6 (6 health) | $189K |
Recommended Buyer Guides for Calcasieu County
While many sites publish identical guide lists across every county they cover, the selection here changes by location — driven by the EPA, NSF, FEMA, and CDC datasets that describe the actual conditions documented for this jurisdiction in the federal record.
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
Deep Dive Reports
Detailed analysis for Calcasieu County, Louisiana
Overview
Calcasieu County in Louisiana covers 19 ZIP codes with an average Home Safety Score of B (84/100).
7 of 19 ZIP codes have recorded EPA violations. 13 health-based violations have been documented.
← Back to Louisiana water quality report
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Updated daily.