Hard water and iron in Gulf Coast groundwater

28.1 Where does the water under Wharton County come from?

It comes from the Gulf Coast Aquifer. The Texas Water Development Board's aquifer page describes it as a band of sand, silt, clay and gravel beds running from Louisiana to Mexico, made up of the Jasper, Evangeline and Chicot aquifers and covering 41,970 square miles in 56 counties.

The City of Wharton pumps from the Chicot, through five well sites, and rural wells across the county tap the same layered system, as the 1982 state report on the county's groundwater describes. TWDB says quality varies with depth and place: generally good, under 500 mg/L of dissolved solids, in the central and northeastern parts, and saltier toward the south. A 1982 state report found slightly and moderately saline water in the Evangeline under the southern part of Wharton County.

28.2 How hard is the groundwater around Wharton?

Hard, by the best published measure we have. Report 270, written by USGS hydrologists for the state in July 1982, gathered about 425 hardness analyses from Colorado, Lavaca and Wharton counties. More than two-thirds fell in the top hardness class, above 180 mg/L, and fewer than 5 percent were soft. The report calls Chicot water hard, mostly calcium bicarbonate.

Those samples are regional and old, collected over roughly 40 years before 1982. They are not a reading for your tap. The City of Wharton's 2024 and 2025 water quality reports publish no hardness or iron figure at all, so this book gives none for city water.

Grains per gallon (TWON)	TWON label	mg/L (Report 270, 1982)	Report 270 label
Under 1	Soft	60 or less	Soft
1 to 3.5	Slightly hard	60 or less	Soft
3.5 to 7	Moderately hard	61 to 120	Moderately hard
7 to 10.5	Hard	121 to 180	Hard
Over 10.5	Top class	More than 180	Top class

28.3 What does hard water do to a house?

It wastes soap and builds scale. The Texas Well Owner Network's well guide, ESC-029, says hard water takes more soap for laundry and washing and leaves scale in dishwashers, washing machines, water heaters and plumbing fixtures. There is no federal health standard for hardness, primary or secondary.

Scale matters most where water gets hot. A tank that lives in a hot attic is already working hard; Gulf Coast heat on attic water heaters covers the drain-pan and maintenance side of that.

28.4 How much iron is in the water, and is it a health problem?

Usually not much, and EPA treats it as a nuisance. EPA's secondary standards page, updated 26 May 2026, sets a non-enforceable guide of 0.3 mg/L for iron and 0.05 mg/L for manganese. Above those, iron brings rusty color, sediment, a metallic taste and reddish-orange stains; manganese brings black to brown color and black stains.

Report 270 found only six of about 110 iron analyses above 0.3 mg/L, and five of those came from Lavaca County. That is an old, small sample, and single wells differ, so do not read it as a promise that yours is clean.

TWON adds two habits of iron worth knowing. Water can come out clear and form particles once it meets air, and ordinary detergents will not lift iron or manganese stains; chlorine bleach can even set them deeper.

28.5 What is the reddish slime in the toilet tank?

Most likely iron bacteria. TWON says water high in iron and manganese often carries naturally occurring bacteria that feed on those minerals and leave reddish-brown (iron) or brownish-black (manganese) slime in toilet tanks, and that the growth can clog a water system.

TWON's treatment table suggests shock chlorination of the well and storage to knock them back. That job means opening the well, which belongs to a TDLR-licensed driller or pump installer; disinfecting a flooded well explains why.

28.6 Why did city water run brown after a new well came online?

Stirred-up sediment. When a new city well started on 19 February 2024, the City of Wharton's press release warned of temporary discoloration. It advised running cold taps for a few minutes until clear and holding off on laundry to avoid stains. That is the city's guidance for that event; any later notice will carry its own.

28.7 How do you find out what is in your own well?

Test it. TWON's Well Owner's Guide to Water Supply lists hardness, iron and manganese among the baseline tests, along with arsenic, chloride and fluoride, and notes that Gulf Coast aquifers can run high in dissolved solids from ancient salt deposits. Use a lab accredited by TCEQ; testing well water explains how to find one and how to collect a sample.

If only the hot taps smell like rotten eggs, TWON points to the water heater rather than the well: the magnesium rod inside reacts with sulfate. A licensed plumber can swap it for a zinc rod, though that may void the warranty.

28.8 Which treatment fits which problem?

The fix depends on what the test shows. TWON's Appendix C matches problems to methods:

1. Hardness: a water softener.
2. Low iron with stains: a particle filter, reverse osmosis or distillation.
3. Higher iron: an oxidizing filter regenerated with potassium permanganate, followed by a particle filter.
4. The highest iron levels: chlorination followed by a particle filter.
5. Iron bacteria: shock chlorination of the well and storage, done by a licensed professional.

A unit that later sits in floodwater needs its own care; see softeners and filters after a flood.

Questions readers ask

Is hard water bad for my health?

EPA sets no health standard for hardness, primary or secondary. The trouble it causes is practical: more soap, scale on fixtures and shorter-lived appliances.

Does City of Wharton water need a softener?

The city's 2024 and 2025 reports publish no hardness figure, so there is no city number to judge by. A hardness test at your own tap, from a lab or a field kit, will answer it for your house.

Why do orange stains come back after bleaching the tub?

TWON says detergents do not remove iron stains and chlorine bleach may make them worse. Treating the water upstream is what stops new stains.

Can a softener remove iron too?

TWON's table pairs softeners with hardness and lists filters, oxidizing systems or chlorination for iron. Ask the maker what iron level a given unit is rated to handle before you rely on it.

How often should a rural well be tested?

AgriLife suggests yearly tests for nitrate, dissolved solids and bacteria, plus a test after any change in color, taste or odor. Hardness and iron are part of a baseline test you can repeat when you change treatment.

What this chapter rests on

The regional numbers here come from TWDB's aquifer page and its 1982 Report 270, the Texas Well Owner Network's ESC-029 guide (April 2019 edition) and EPA's secondary standards page, checked on 11 Nov 2026. Report 270's samples are decades old and span three counties. Neither City of Wharton water report gives hardness or iron, and this book could not confirm El Campo's figures; ask the City of El Campo for its water report.

Notes to chapter 28

1. Texas Water Development Board — Gulf Coast Aquifer · aquifer layers, area, regional quality · checked 11 Nov 2026
2. Texas Water Development Board — Report 270, Ground-Water Resources of Colorado, Lavaca, and Wharton Counties (July 1982) · hardness and iron samples, hardness classes, saline water in the south · checked 11 Nov 2026
3. City of Wharton — 2025 Consumer Confidence Report, TX2410005 · Chicot source, five wells, no hardness or iron figure · checked 11 Nov 2026
4. City of Wharton — New Water Well press release, 19 February 2024 · temporary discoloration guidance · checked 11 Nov 2026
5. US EPA — Secondary Drinking Water Standards: Guidance for Nuisance Chemicals · iron 0.3 mg/L, manganese 0.05 mg/L, non-enforceable · checked 11 Nov 2026
6. Texas A&M AgriLife Extension / Texas Well Owner Network — Well Owner's Guide to Water Supply, ESC-029 · hardness scale, iron bacteria, stains, treatment table, anode odor, baseline tests · checked 11 Nov 2026
7. Texas A&M AgriLife Extension — Water Well Basics, SCSC-PU-137 · yearly testing advice · checked 11 Nov 2026
8. TCEQ — Environmental Laboratory Accreditation · accredited lab search · checked 11 Nov 2026