← Well Drilling Guide
Technical Reference

Well Water Treatment Guide

Well water quality varies enormously by region and geology. Understanding what is in your water and how to treat it protects your family and your plumbing. Here is what to test for and what each treatment option costs.

Basic Test Cost
$30 – $150
Comprehensive Test
$150 – $400
Water Softener
$800 – $3,000 installed
Iron Filter
$600 – $2,500 installed
What to Test For
At minimum, test annually for: coliform bacteria (indicates fecal contamination), nitrates (agricultural runoff, especially near farms or septic systems), and pH. Full testing (recommended at new construction and every 3–5 years) adds: iron, manganese, hardness, arsenic, radon, lead, sulfide, turbidity, and total dissolved solids. Your state lab or certified private lab can run these tests. Cost: $30–$400 depending on panel.
Iron in Well Water
Iron is the most common well water problem, especially in the Midwest, Southeast, and Northeast. Symptoms: orange/rust stains in toilets and sinks, metallic taste, orange water. Treatment: under 2 PPM — water softener may be adequate. 2–10 PPM — iron filter (oxidizing filter). Over 10 PPM — aeration + filtration. Bacterial iron (iron bacteria) is harder to treat and requires shock chlorination plus filtration. Cost: $600–$2,500 installed.
Hard Water
Hardness (calcium and magnesium) causes scale buildup in pipes and appliances, soap scum, and reduced appliance life. Measured in grains per gallon (GPG) or mg/L. Soft: under 1 GPG. Hard: 7–10 GPG. Very hard: over 10 GPG (common in the Midwest and Texas). Treatment: ion exchange water softener is the standard solution. Cost: $800–$2,500 installed for a whole-house softener.
Low pH (Acidic Water)
pH below 7 is acidic. pH below 6.5 aggressively corrodes copper pipes, causing blue-green staining in sinks and potentially leading to pipe failure. Common in North Georgia, NC Piedmont, New England granite wells. Treatment: calcite neutralizer filter (raises pH by dissolving calcium carbonate). Very low pH may need soda ash injection. Cost: $600–$2,000 installed.
Bacteria
Coliform bacteria in a well indicates contamination — usually from surface water entry, a cracked casing, or a nearby septic system. Treatment: shock chlorination (pour bleach down the well, run all fixtures until you smell chlorine, wait 12–24 hours, flush thoroughly). If bacteria return repeatedly, find and fix the source of contamination. Continuous treatment requires a UV disinfection system ($500–$1,200) or chlorination system.
Hydrogen Sulfide (Rotten Egg Smell)
Sulfur bacteria produce hydrogen sulfide gas in some wells, especially in Florida, parts of Texas, and coastal areas. Very low concentrations (under 0.5 PPM) may be treated with activated carbon. Higher levels need aeration, chemical oxidation, or a multi-stage treatment system. Cost: $500–$3,000 depending on concentration and system size.
Common Questions
Test for bacteria and nitrates annually. Test for a full panel (including metals, hardness, pH, etc.) every 3–5 years, or whenever you notice a change in taste, odor, or appearance. Always test after flooding, a new baby joins the household, or if a nearby agricultural or industrial facility changes operations.
Iron is the most widespread well water problem in the US, followed by hardness. Both are aesthetic issues rather than health hazards at typical levels. Bacterial contamination is less common but a genuine health concern that requires immediate attention.
It depends on the problem. Iron, hardness, and pH issues affect all water and require whole-house treatment to protect plumbing and appliances. For drinking water concerns only (arsenic, nitrates, etc.), a reverse osmosis system at the kitchen sink ($300–$800) is more cost-effective than treating all household water.
Arsenic occurs naturally in rock formations in many regions — particularly the Southwest, New England, and parts of the Midwest. The EPA limit is 10 PPB. If your area has known arsenic issues, test specifically for it. Treatment: reverse osmosis at the drinking water tap ($300–$800) is effective and affordable for most households.
Related Topics
Technical Reference
Water Well Yield — GPM Requirements & Calculation
Technical Reference
Well Pump Sizing Guide
Technical Reference
Water Well Casing Size Guide
Important: Well drilling costs, depths, and regulations vary significantly within each state. This page provides general reference information only. Always get quotes from multiple licensed well contractors in your area and verify current state regulations before proceeding.