Hardest Water in Louisiana
15 cities ranked by water hardness. Thibodaux tops the list at 180 PPM.
Louisiana's water hardness varies significantly by city and water source. The state average across our database is 81 PPM, which is moderately hard. Some cities need treatment while others do not. 7% of cities we track in Louisiana have hardness above 120 PPM.
Thibodaux has the hardest water at 180 PPM (10.5 GPG). At this level, expect visible scale on faucets, reduced water heater efficiency, and higher soap usage. A salt-based water softener can pay for itself over time in energy and consumable savings, though the payback depends heavily on your hardness and whether you heat water with gas or electricity. Estimate your payback. Monroe has the softest water at just 40 PPM. No softener is needed.
| # | City | PPM | GPG | Level | Softener? |
|---|---|---|---|---|---|
| 1 | Thibodaux | 180 | 10.5 | Very Hard | Yes |
| 2 | Lafayette South | 100 | 5.8 | Moderately Hard | Optional |
| 3 | Baton Rouge | 86 | 5 | Moderately Hard | Optional |
| 4 | Kenner | 85 | 5 | Moderately Hard | Optional |
| 5 | Marrero | 85 | 5 | Moderately Hard | Optional |
| 6 | New Orleans | 80 | 4.7 | Moderately Hard | Optional |
| 7 | Metairie | 80 | 4.7 | Moderately Hard | Optional |
| 8 | Shreveport | 79 | 4.6 | Moderately Hard | Optional |
| 9 | Houma | 75 | 4.4 | Moderately Hard | Optional |
| 10 | Lake Charles | 70 | 4.1 | Moderately Hard | Optional |
| 11 | Lafayette | 65 | 3.8 | Moderately Hard | Optional |
| 12 | New Orleans Downtown | 65 | 3.8 | Moderately Hard | Optional |
| 13 | Slidell | 60 | 3.5 | Moderately Hard | Optional |
| 14 | New Orleans Uptown | 60 | 3.5 | Moderately Hard | Optional |
| 15 | Monroe | 40 | 2.3 | Slightly Hard | No |