State distribution
Hardness across indexed ZIPs
Counts describe published ZIP profiles, not a population-weighted statewide sample.
Soft · 0–60 PPM41
Moderately hard · 61–120 PPM37
Hard · 121–180 PPM19
Very hard · 181+ PPM5
State water index
Louisiana water hardness
Search 52 indexed communities and 102 ZIP profiles, then compare the underlying utility, source, distance, and reporting context.
Median indexed hardness
90PPM
Moderately Hard
Indexed range 4.8–314 PPM
- ZIP profiles
- 102
- Cities
- 52
- Matched utilities
- 56
- Counties
- 34
Understanding Louisiana
Why local comparisons matter here
Louisiana combines Mississippi River and other surface-water systems with alluvial and coastal-plain aquifers. Source choices differ between major river cities and smaller groundwater systems.
In this index, soft is the largest category, covering 41 of 102 profiles with hardness data. The state median is 90 PPM, but the full indexed range is 4.8–314 PPM.
Evidence coverage
What the current records support
- Hardness estimate
- 100%
- Lead 90th percentile
- 100%
- Copper 90th percentile
- 12%
29
Low-confidence hardness profiles
29
Nearest site more than 25 miles away
Reported source water
Utility source mix
- Groundwater
- 46
- Surface water
- 10
Highest medians
Hardest indexed cities
- 1. Winnsboro314 PPM
- 2. Start268 PPM
- 3. Lake Providence267 PPM
- 4. Bastrop245 PPM
- 5. Gretna157 PPM
Lowest medians
Softest indexed cities
- 1. Springhill5 PPM
- 2. Shongaloo5 PPM
- 3. Minden5 PPM
- 4. Belmont12 PPM
- 5. Ruston15 PPM
City directory
Explore Louisiana by city
Search by city or county, then sort by name, hardness, or ZIP coverage.
52 cities · 102 ZIP profiles
52 cities found
Page 1 of 3
Abbeville
Vermilion Parish · 1 ZIP
127PPM
Single indexed valueNo active flag
Alexandria
Rapides Parish · 4 ZIPs
51PPM
Range 41.8–81.8No active flag
Bastrop
Morehouse Parish · 1 ZIP
245PPM
Single indexed valueNo active flag
Baton Rouge
East Baton Rouge Parish · 16 ZIPs
119PPM
Range 112–122No active flag
Belmont
Sabine Parish · 1 ZIP
12PPM
Single indexed valueNo active flag
Berwick
St. Mary Parish · 1 ZIP
141PPM
Single indexed valueNo active flag
Bogalusa
Washington Parish · 1 ZIP
32PPM
Single indexed value11 active records
Breaux Bridge
St. Martin Parish · 1 ZIP
122PPM
Single indexed value1 active record
Broussard
Lafayette Parish · 1 ZIP
125PPM
Single indexed valueNo active flag
Carencro
Lafayette Parish · 1 ZIP
116PPM
Single indexed value1 active record
Covington
St. Tammany Parish · 2 ZIPs
32PPM
Single indexed value1 active record
Denham Springs
Livingston Parish · 1 ZIP
112PPM
Single indexed valueNo active flag
Deridder
Beauregard Parish · 1 ZIP
73PPM
Single indexed valueNo active flag
Egan
Acadia Parish · 1 ZIP
93PPM
Single indexed value1 active record
Folsom
St. Tammany Parish · 1 ZIP
32PPM
Single indexed valueNo active flag
Franklin
St. Mary Parish · 1 ZIP
145PPM
Single indexed valueNo active flag
Gonzales
Ascension Parish · 1 ZIP
112PPM
Single indexed valueNo active flag
Gretna
Jefferson Parish · 1 ZIP
157PPM
Single indexed valueNo active flag
Hammond
Tangipahoa Parish · 3 ZIPs
32PPM
Single indexed valueNo active flag
Houma
Terrebonne Parish · 2 ZIPs
153PPM
Range 145–160.5No active flag
Jennings
Jefferson Davis Parish · 1 ZIP
93PPM
Single indexed value2 active records
Kaplan
Vermilion Parish · 1 ZIP
127PPM
Single indexed valueNo active flag
Lake Charles
Calcasieu Parish · 5 ZIPs
93PPM
Range 93.1–118No active flag
Lake Providence
East Carroll Parish · 1 ZIP
267PPM
Single indexed value11 active records
County comparison
Highest indexed county medians
| County | Median | Range | ZIP profiles |
|---|---|---|---|
| Franklin Parish | 314 PPM | 314–314 | 1 |
| Richland Parish | 268 PPM | 245–290 | 2 |
| East Carroll Parish | 267 PPM | 266.5–266.5 | 1 |
| Morehouse Parish | 245 PPM | 245–245 | 1 |
| Jefferson Parish | 157 PPM | 156.5–156.5 | 1 |
| Terrebonne Parish | 153 PPM | 145–160.5 | 2 |
| Lafourche Parish | 149 PPM | 149–149 | 1 |
| St. Mary Parish | 145 PPM | 141–145 | 3 |
| Vermilion Parish | 127 PPM | 126.5–126.5 | 2 |
| Iberville Parish | 127 PPM | 126.5–126.5 | 1 |
| Lafayette Parish | 125 PPM | 114.5–126.5 | 5 |
| St. Martin Parish | 122 PPM | 122–122 | 1 |