What's in Guste Island water

Madisonville, St. Tammany Parish · PWS ID LA1103189

The short answer

Guste Island water is soft, about 0.8 grains, chloramine-disinfected groundwater. The fix for this system: a whole-home catalytic carbon filter, manganese filtration, plus optional reverse osmosis at the kitchen sink.

Guste Island water carries chloramine at 2.5 parts per million, and it tests soft at 14.1 milligrams per liter, about 0.8 grains. The published report also shows manganese at the aesthetic limit.

Beneath the surface

Your water reportGuste Island

Magnolia - Guste Island (CSWR) · PWS ID LA1103189 · 2025 water quality report

chloramine, 2.5 ppm, disinfectant at swimming pool levels · The pool taste and smellCatalytic carbon takes it out

manganese at the aesthetic limit · Orange or dark stainingManganese filtration is built for exactly this

That pool taste in your coffee and ice is chloramine, the disinfectant this system uses. The staining in tubs and laundry comes from the manganese in the report, and filtration built for it takes it out.

Water system boundaries interlock around here, so we confirm yours by address before we quote anything.

What we'd install

Based on the report, whole-home catalytic carbon for the chloramine at every tap. Manganese filtration handles the staining before it reaches your fixtures. Reverse osmosis at the kitchen sink is optional, for drinking water and coffee. The quote lists it as its own line so you can take it or leave it.

**Reverse osmosis**Drinking water at the kitchen sink

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What this does for your home

Easier on the rubber seals, gaskets, and hoses inside your appliances
No chloramine taste or smell in your coffee, tea, and ice
No more orange and dark staining in tubs and laundry
Bottled-quality drinking water on tap for pennies a gallon

Cutaway of a water heater with sediment settled at the bottom

Easier on the parts that wear out

Sediment settles in your water heater and lowers its efficiency, and chlorine and chloramine embrittle the rubber seals, gaskets, and hoses inside your appliances over time. Filtering the whole house is gentler on all of it.

U.S. Dept. of Energy Energy Saver; ASTM D6284.

Source: Magnolia - Guste Island (CSWR) annual water quality report.PWS ID LA1103189, verifiable in the EPA Safe Drinking Water database →Figures are as published by the system; see the original report for sampling methods and ranges.Get my written plan and price →

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The public recordNo violations on record

This Magnolia Water system (Guste Island) has a clean violation record. EPA shows no drinking-water violations as of August 2026. A 2022 state survey noted source and management deficiencies, which are findings, not violations. Its operator, Magnolia Water, is under a Louisiana Public Service Commission investigative audit of its billing and service practices, due February 2027.

EPA ECHO · LPSC Docket U-37584. Public records, current as of August 2026. They update quarterly. Operators: contact us to correct an error.

What this means at your house

Your water arrives with chloramine in it, at 2.5 parts per million. That is the disinfectant the Guste Island system uses, and it is what people taste in coffee, in ice, and in the first glass of the day. For context, swimming pools are kept between 1 and 3 parts per million of chlorine, and this water's disinfectant level lands in that same range. Chloramine does not gas off in a pitcher the way chlorine does, so catalytic carbon is the piece that takes it out, at every tap in the house.

This is soft water. Hardness tests at 14.1 milligrams per liter, about 0.8 grains, and for a family using around 300 gallons a day that puts roughly 13 pounds of dissolved rock through the house in a year. Genuinely hard water runs well past a hundred pounds a year, and that difference is why a softener is not in the package for this neighborhood.

The water here is groundwater, pumped from Guste Island Water Supply Well 1. The report also shows manganese at the aesthetic limit. That is what causes the staining that shows up in tubs, sinks, and laundry over time, and manganese filtration is built for exactly that.

How the report becomes the recommendation

Each finding decides a piece of the package, including the pieces we leave out.

The report shows	At your house	The answer	Why that one
Chloramine at 2.5 ppm	The taste and smell in coffee, ice, and the first glass of the day	Whole-home catalytic carbon	Chloramine holds together inside plain carbon. Catalytic carbon is processed to break it apart.
Hardness at 0.8 grains, soft	No scale problem to fix	No softener	The resin would have nothing to grab, so it stays out of the quote.
Manganese at the aesthetic limit	Orange or dark staining in tubs, sinks, and laundry	Manganese filtration	It is built for exactly this kind of staining.

Water system boundaries interlock around here, so we confirm yours by address before we quote anything.

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