Selma has two water systems: the main one runs on town wells with chlorine, and a separate Countyline system buys surface water from Johnston County and had a 2025 trihalomethane violation. Which one serves you changes the right treatment, and hardness isn't reported for either, so test first. Call the number on this page to be connected with a local plumber in Selma.

Two systems in one town
The Town of Selma's main water system draws from its own groundwater wells, Wells #1 and #3 through #10, and disinfects with chlorine (running average 1.42 ppm). Sodium was 34.8 ppm and pH 7.9; hardness isn't listed. A separate Selma-Countyline system distributes surface water bought from Johnston County East. Its 2025 report shows a TTHM result of 93 ppb against the 80 ppb limit (June 2025), plus reporting violations. The main system had a violation for its lead service line inventory reporting; lead itself was below detection at the 90th percentile in 2023. The town's report doesn't describe which streets are on Countyline, so ask the town.
What to do now
- Find out which system serves your address. Town Hall or your water bill should say.
- On the main well system, test hardness and iron. Groundwater can carry more minerals than surface water.
- On the Countyline system, consider an under-sink carbon filter certified to NSF/ANSI 53 for TTHM reduction.
- For chlorine taste on either system, standard activated carbon works, since neither uses chloramine as its main disinfectant.
- In an older home, have a plumber check pipes before buying equipment; about 55% of Selma homes predate 1980.
Symptom and likely cause
| Symptom | Likely cause |
|---|---|
| White scale on fixtures | Hardness from well water, if testing confirms |
| Orange or black stains | Iron or manganese |
| Chlorine taste | Chlorine disinfection |
| Rust in an older house | Corroding galvanized pipe |
| Town notice about TTHM | Disinfection byproducts on Countyline |
Cost factors
- Softener, iron filter, carbon filter or a combination
- Whole-house or point-of-use
- Condition of older piping at the main
- Drain and power access
- Replacement media and salt
Many Selma homes are older, so a plumber may suggest replacing the main shutoff or a short run of pipe while installing equipment. That adds some cost up front but makes future filter changes simpler. If you're on the Countyline system and the town's numbers improve in later reports, you can revisit whether a filter is still needed. On the main well system, a retest every year or two shows whether hardness or iron levels are shifting.
Water Softeners & Filtration questions in Selma
Can a home filter reduce trihalomethanes?
Where do I find the hardness of my town's water?
What treatment handles iron and manganese stains?
What gets rid of the chlorine or chloramine taste?
More plumbing services in Selma
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