Grand Coteau Tap Water Quality Report
No test results on file for TOWN OF GRAND COTEAU WATER SYSTEM, Grand Coteau's water system. Results from other water systems on this page are listed under each system's name; they are not TOWN OF GRAND COTEAU WATER SYSTEM's results and do not make a verdict for Grand Coteau. Check TOWN OF GRAND COTEAU WATER SYSTEM's latest Consumer Confidence Report for its current test results.
Water system
TOWN OF GRAND COTEAU WATER SYSTEM
1 other system is listed for Grand Coteau. See its figures
People Served
1,650
Health-based violations since 2020
11
TOWN OF GRAND COTEAU WATER SYSTEM. EPA SDWA violation data as of Q2 2026 (downloaded 2026-07-09).
Is Grand Coteau Tap Water Safe to Drink?
Everything we hold on Grand Coteau's water is below — a thin record, not a clean one. Testing your own water is the way to find out what your tap is actually delivering.
TOWN OF GRAND COTEAU WATER SYSTEM, Grand Coteau's water system, serves 1,650 people. 1 other system is listed for Grand Coteau. Each system's results are listed under its own name, never added to TOWN OF GRAND COTEAU WATER SYSTEM's.
Boil water advisories are issued by water systems and state agencies, and they change from day to day. Boil water advisories in Louisiana
Grand Coteau Water Service Areas
Fluoride in Grand Coteau's water
TOWN OF SUNSET WATER SYSTEM
PWSID LA1097015
No fluoride level in our data for TOWN OF SUNSET WATER SYSTEM. Your utility's annual water quality report (CCR) lists it.
TOWN OF GRAND COTEAU WATER SYSTEM
PWSID LA1097001
No fluoride level in our data for TOWN OF GRAND COTEAU WATER SYSTEM. Your utility's annual water quality report (CCR) lists it.
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General-Purpose Water Filters for Grand Coteau
No test results are on file for TOWN OF GRAND COTEAU WATER SYSTEM, Grand Coteau's water system, so these are general-purpose NSF/ANSI 53 certified filters, not chosen for any contaminant.
Pentair Residential Filtration, LLC
Everpure Residential H-300-NXT
NSF Certified:
Capacity
3001 gal
Filter Life
10 mo
Flow Rate
0.5 gpm
Removes 5 contaminants:
Whirlpool Corporation
W11256135
NSF Certified:
Capacity
1001 gal
Filter Life
3 mo
Flow Rate
0.7 gpm
Removes 19 contaminants:
+14 more
Benzene, Carbofuran, Chlorine (Free), Chlorine (Total), Chlorine Dioxide, Chlorobenzene, Cryptosporidium, Ethylbenzene, Lead, Mercury, Metolachlor, Tetrachloroethylene, Toxaphene, Turbidity
Whirlpool Corporation
W11569861
NSF Certified:
Capacity
1001 gal
Filter Life
3 mo
Flow Rate
0.52 gpm
Removes 22 contaminants:
+17 more
Atrazine, Benzene, Carbofuran, Chlorine (Free), Chlorine (Total), Chlorine Dioxide, Chlorobenzene, Cryptosporidium, Ethylbenzene, Lead, Mercury, Metolachlor, Styrene, Tetrachloroethylene, Toxaphene, Trichloroethylene, Turbidity
Santevia
Bath Filter
NSF Certified:
Flow Rate
0.36 gpm
Highlights:
- Organic cotton design reduces plastic used in construction
- Affordable upfront & ongoing cost
- The only bath filter that removed 100% chlorine with “normal” faster faucet flow
Removes 1 contaminants:
No test results on file — test your own tap
We don't hold water-quality results for this system yet, so nobody can tell you what is in your water from published data. A certified lab test is the way to find out.
SimpleLab
Advanced Home Water Test
$269
Comprehensive water analysis testing over 200 contaminants including bacteria, heavy metals, and chemical compounds.
Tap Score
Advanced Microplastics Test
$829
Cutting-edge testing for microplastics particles in drinking water using advanced laboratory techniques.
Tap Score
Haloacetic Acids (HAA9) Test
$275
Tests for disinfection byproducts formed when chlorine reacts with organic matter in water treatment.
What Grand Coteau's water readings can explain
We publish a city-level hardness figure for Grand Coteau, resolved from its water systems where they report one and estimated from county sampling where they do not. Each page starts with the hot-tap and cold-tap check, then shows what your own water system reported.
On a private well near Grand Coteau? Public-water results do not apply to private wells. See St. Landry Parish well water testing and USGS risk data — modeled arsenic, nitrate, and the tests to run.
Water softener cost and installation in Grand Coteau
Grand Coteau's tap water has an estimated 4.2 grains per gallon (72.0 mg/L, county sampling in St. Landry Parish) — moderately hard on the USGS scale, below the range where scale is usually worth treating.
Water softener cost for an estimated 4.2 gpg water in Grand Coteau — equipment and local installation labour for your ZIP code, with the sizing arithmetic shown in full. For the national picture first, read what a water softener costs — equipment, installation labour and ten-year ownership, each separated out. For Louisiana as a whole, read water softener cost in Louisiana — priced against the plumber wage published for the state.
Frequently Asked Questions About Grand Coteau Tap Water
No test results on file for TOWN OF GRAND COTEAU WATER SYSTEM, Grand Coteau's water system. Results from other water systems on this page are listed under each system's name; they are not TOWN OF GRAND COTEAU WATER SYSTEM's results and do not make a verdict for Grand Coteau. Check TOWN OF GRAND COTEAU WATER SYSTEM's latest Consumer Confidence Report for its current test results.
Spotted something off on this page?
Residents keep our data honest.
This form corrects our data; it does not reach TOWN OF GRAND COTEAU WATER SYSTEM. For a problem with your water now (discolored water, no water, low pressure, a leak), contact TOWN OF GRAND COTEAU WATER SYSTEM directly.
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