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Treatment Technologies

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How specific treatment types work, what they treat effectively, and where each fits. Softeners, reverse osmosis, carbon, UV, sediment, and specialty media — explained at the level a homeowner can compare options.

Articles in this topic

Reverse osmosis — under-counter and whole-home

Reverse osmosis forces water through a semipermeable membrane that removes a broad range of dissolved contaminants — including PFAS, nitrate, arsenic, lead, and dissolved solids — producing the highest-purity water of the common residential treatment technologies. An RO system is a multi-stage architecture with pretreatment (to protect the membrane) and post-treatment (to make the water fit its use), configured to the specific water and household. RO comes in two configurations: point-of-use (under-counter) treating one tap, and point-of-entry (whole-home) treating all household water. This article explains how RO works, what each configuration does, what to consider, and the factors that inform choosing between them.

June 10, 2026Read article →

Whole-home water softeners

A water softener removes hardness — dissolved calcium and magnesium — through ion exchange, addressing scale on fixtures, soap scum, reduced soap and shampoo effectiveness, hair and skin feel after washing, and accelerated wear on water heaters and appliances. Water hardness varies widely across North Carolina and southern Virginia — surface-water municipal supplies tend toward the softer end of the range, well water and groundwater-fed community systems tend to be harder. This article explains how softeners work, what they address at different hardness levels, what they cost to run, and how to think about whether a softener fits your household.

June 10, 2026Read article →

Water treatment types — an overview of your options

Water treatment technologies each do a specific job. Softeners remove hardness. Reverse osmosis removes a broad range of dissolved contaminants for high purity. Carbon filtration removes chlorine, taste, odor, and some organic chemicals. UV disinfects. pH neutralizers correct acidic water. Iron and manganese filters remove those specific metals. This article is an overview of the major residential treatment technologies, what each addresses, and how to think about which technology matches which situation.

June 10, 2026Read article →

These articles touch on treatment technologies as a related subject.

Also relevant

Iron, manganese, and hydrogen sulfide

Iron, manganese, and hydrogen sulfide are the three most common water quality complaints on well water in North Carolina and southern Virginia. Iron stains orange, manganese stains black, and hydrogen sulfide smells of rotten eggs. What you see and smell often identifies which one you have, and iron in particular occurs in two forms that call for different treatment. This article covers how to recognize each, how testing narrows it down, which treatment approaches apply, and why the order of treatment matters.

October 7, 2026Read article →

PFAS in drinking water

PFAS are a large family of manufactured chemicals that persist in water and in the body. The EPA set the first enforceable federal drinking water limits for six PFAS in April 2024; as of October 2026 the limits for PFOA and PFOS remain in place while four others are the subject of a proposed rescission and ongoing litigation. North Carolina's Cape Fear River basin is one of the most studied PFAS-affected regions in the country. This article covers where PFAS come from, how the regulatory picture currently stands, how to find out what is in your water, and which treatment approaches are certified to reduce them.

October 7, 2026Read article →

Lead in drinking water

Lead in drinking water comes primarily from premises plumbing and from service lines and upstream distribution piping — not usually from the water leaving the treatment plant. The federal action level is 15 ppb, dropping to 10 ppb under the 2024 Lead and Copper Rule Improvements. Testing is the only way to know your specific situation. Treatment options range from simple flushing habits to certified point-of-use filters, reverse osmosis, and whole-home systems, forming a layered defense that starts at the drinking-water tap and can expand from there based on your household's preferences.

August 24, 2026Read article →

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