How often should I test my well water?

The EPA recommends testing at minimum once per year for: total coliform bacteria, nitrates, pH, and total dissolved solids (TDS). Test more frequently if: you notice changes in taste, color, or odor, after flooding or heavy rains, after well maintenance or repair, if anyone in the household has unexplained gastrointestinal illness, or if you live near agricultural, industrial, or septic sources. Additional tests (arsenic, lead, radon, VOCs, pesticides, hardness, iron/manganese) should be based on your local conditions and geologic area. Cost: $50-$200 for a basic panel. Find a certified lab through your state health department or at epa.gov/safewater.

How much does a well water treatment system cost?

Costs vary by contaminant: Water softener (hard water): $800-$2,500 installed. Iron/manganese filter: $800-$2,500 installed. UV disinfection (bacteria): $500-$1,500 installed. Reverse osmosis (under-sink, for nitrates, lead, arsenic): $200-$500. Whole-house reverse osmosis: $3,000-$8,000. Arsenic filter (whole-house): $1,000-$3,000. Radon aeration system: $3,000-$5,000. Sediment filter (whole-house): $200-$500. Annual maintenance (filters, salt, UV bulbs): $100-$500/year depending on system type. The first step: test your water to identify what needs treatment. Then choose the appropriate system for your specific contaminants.

Is well water safe to drink?

Well water can be perfectly safe — or it can contain harmful contaminants. The safety depends entirely on: the local geology (some areas have naturally occurring arsenic, radon, or heavy metals), nearby land use (agricultural runoff, septic systems, industrial activity), the well construction and condition (a properly constructed and maintained well is much safer than an old, damaged, or shallow well), and whether the water is tested and treated as needed. The key difference from city water: there is no automatic monitoring or treatment. The homeowner is responsible. The bottom line: test your well water at least annually. If contaminants are found: treat them. With proper testing and treatment, well water is safe to drink.

How do I maintain my well?

Annual: test water quality (bacteria, nitrates, pH, TDS at minimum). Inspect the well cap and casing for cracks, gaps, or damage (prevents pests and surface water from entering). Ensure the ground slopes away from the well head (prevents pooling). Check the pressure tank (should maintain 30-50 PSI, no waterlogging). Every 3-5 years: have a certified well contractor inspect the well (flow rate test, pump performance, and overall condition). When needed: shock chlorinate after contamination events (flooding, positive bacteria test, or after repairs). Replace the pressure switch or pump when signs of failure appear (cycling, sputtering, reduced flow). Keep records of all tests, inspections, and maintenance.

Article

Woodworking & Lumber

Well Water Guide: Testing, Treatment & Maintenance

Lumberama Editorial Team, Water Quality & Well System Specialists Jul 29, 2026 14 min read

Private Well Basics

Approximately 43 million Americans (about 13% of the population) rely on private wells for their drinking water. Unlike public water systems (which are regulated and monitored by the EPA under the Safe Drinking Water Act), private wells are the responsibility of the homeowner. There is no federal requirement to test or treat private well water. The homeowner is responsible for: testing the water regularly, treating any contaminants found, and maintaining the well system. This guide covers everything a private well owner needs to know.

Testing

The EPA recommends testing private well water at least once per year.

Annual tests (minimum): Total coliform bacteria (indicates possible contamination from surface water or sewage), nitrates (from agricultural runoff, septic systems, or fertilizers; dangerous to infants), pH (affects corrosion and treatment effectiveness), and total dissolved solids (TDS, a general indicator of water quality).

Additional tests (based on local conditions): Arsenic (common in certain geologic areas), lead (from plumbing, especially in homes with lead service lines or solder), iron and manganese (cause staining and taste issues), hardness (calcium and magnesium), radon (a radioactive gas that can dissolve into groundwater), volatile organic compounds (VOCs, near industrial areas), and pesticides (near agricultural areas).

Test when: Annually (routine), when you notice changes in taste, color, or odor, after flooding (flood water can contaminate wells), after well maintenance or repair, when a nearby land use changes (new construction, agricultural activity), if anyone in the household has unexplained gastrointestinal illness, and when buying a property with a private well (as part of the home inspection).

Where to test: Certified labs (find one at epa.gov/safewater or through your state health department). Cost: $50-$200 for a basic panel, $200-$500 for a comprehensive panel.

Common Contaminants and Treatment

Bacteria (coliform, E. coli): Treatment: UV disinfection ($500-$1,500 installed), chlorination system ($500-$1,500), or shock chlorination (one-time treatment, $50-$100).

Iron and manganese: Causes orange/brown staining and metallic taste. Treatment: iron filter (birm, greensand, or air injection oxidation system), $800-$2,500 installed.

Hard water: Causes scale buildup in pipes and appliances. Treatment: water softener (ion exchange), $800-$2,500 installed.

Nitrates: Dangerous to infants (blue baby syndrome). Treatment: reverse osmosis (point-of-use, under-sink), $200-$500.

Arsenic: A carcinogen. Treatment: whole-house arsenic filter or reverse osmosis, $1,000-$3,000 installed.

Lead: A neurotoxin. Treatment: reverse osmosis (point-of-use) or whole-house lead filter, $200-$1,500. Source: replace lead plumbing.

Radon: Treatment: aeration system ($3,000-$5,000 installed) or granular activated carbon filter ($1,000-$2,000).

Sulfur (hydrogen sulfide): Rotten egg smell. Treatment: air injection oxidation system or chlorination, $800-$2,500 installed.

Sediment: Treatment: sediment filter (whole-house), $200-$500 installed.

Well Maintenance

Annual: test water quality (bacteria, nitrates, pH, TDS). Inspect the well cap and casing for damage, cracks, or gaps (pests and surface water can enter through damaged caps). Ensure the ground slopes away from the well casing (prevents surface water from pooling around the well). Every 3-5 years: have the well inspected by a certified well contractor (flow rate, pump performance, and overall condition). When needed: shock chlorinate after contamination events (flooding, positive bacteria test, or well repair). Maintain the well pump (check pressure switch, pressure tank, and electrical connections). Signs of well problems: reduced water pressure or flow, air sputtering from faucets, muddy or sandy water, changes in taste or odor, and the pump running constantly or cycling frequently.