When You Need a Private Well in Idaho
In Idaho's rural and suburban areas, a private well is needed whenever municipal water isn't available. Homeowners typically drill a well if their property lies beyond the reach of a public water line or if connecting to a distant system is cost-prohibitive. Note that some cities or subdivisions may require new homes to hook to a nearby water main if it exists.
If no public supply is available or required, a domestic (household) well must be permitted and drilled by a licensed driller per Idaho Code §42-235.
Well Drilling Costs in Idaho
Comparing against national numbers? See our national guide to the cost to drill a water well for per-foot rates, itemized components, and what quotes leave out.
Well costs vary widely with depth, geology, and parts used. A typical 100-200 ft domestic well system costs $2,000–$10,000+.
Timeline: From Decision to Drinking Water
In practice, installing a home well often takes 4–8 weeks, depending on permit timing, weather, and site conditions.
Permits & Process
Do You Need a Permit?
Yes. Under Idaho Code §42-235, before drilling the driller or homeowner must get a drilling permit from IDWR.
- Domestic well permit fee: $75
- Irrigation/commercial wells: $200 permit fee
- Processing time: Often 1–3 weeks once application submitted
- Who applies: Licensed driller typically handles application
- Required before: Any drilling work begins
Step-by-Step Process
- Consult drilling contractor: Hire a state-licensed driller who will evaluate site feasibility and needed depth
- Water right check: Domestic wells (<13,000 gal/year) are often exempt, but verify if any water-right claim is needed
- Obtain IDWR permit: Before drilling, apply for permit (driller typically handles)
- Site preparation: Drill crew preps site, installs rig, stakes well location per IDAPA 58.01.08.510 setbacks
- Drill and construct well: Driller drills borehole, sets casing and seal grout meeting IDAPA 37.03.09 standards, installs sanitary well cap ≥18" above ground
- Submit well logs: After completion, driller files Well Driller's Report and Notification of Seal with IDWR
- Pump installation: Pump and related system installed by driller or pump contractor
- System startup: Well is disinfected (chlorinated), flushed, and test-pumped
- Water testing: Collect samples for bacteria and nitrates at minimum
Who Does What?
Driller Handles:
- Licensing requirements (Idaho Code §42-238, IDAPA 37.03.10)
- Permit application submission
- Drilling, casing, grouting
- Initial disinfection
- Filing well report with IDWR
Homeowner Handles:
- Payment of fees
- Site access coordination
- Lab testing coordination
- Record keeping
- Treatment system if needed
Water Quality
Well water testing in Idaho
Idaho DEQ and the Department of Health and Welfare handles private well water quality in Idaho. Idaho has no statewide private-well quality regulations; test annually for bacteria and nitrate, and add arsenic where it occurs naturally in Idaho aquifers (check DEQ’s Private Well Water Drinking Map for your area).
Not sure what to test for? See our national guide to well water testing or order a certified lab test kit shipped to your door.
Recommended Testing Schedule
- Annually: Bacteria (total coliform and E. coli) and nitrates
- Every 3-5 years: Comprehensive chemical/metal scan (arsenic, uranium, fluoride, etc.)
- After any event: Flooding, well repairs, taste/odor changes
Lab fees: $20 coliform, $21-$23 nitrate/arsenic (typical; homeowner pays).
Common Idaho Water Quality Issues
Nitrate
Most widespread threat from ag fertilizers, manure, septic systems. Ubiquitous in agricultural regions, especially Snake River Plain nitrate priority areas.
Arsenic
Naturally-occurring from volcanic/mineral-bearing rocks. Common in many areas; private well owners often find 5-20 ppb levels. Test before use.
Uranium & Other
Present in some aquifers. Also iron/manganese (red-brown staining), hardness (scale), and intermittent bacterial contamination.
Treatment Options
The remedy depends on the contaminant. DEQ and EPA recommend NSF-certified systems:
- Nitrate & Arsenic: Reverse-osmosis, distillation, or ion-exchange systems.RO units widely used to reduce arsenic.
- Iron/Manganese: Manganese greensand or aeration/filtration filters
- Bacteria: Shock-chlorinate the well or install UV disinfection/chlorinator on water line
- Hard Water: Water softener (ion exchange)
- Organic chemicals: Activated carbon filters
Until treatment is installed, boiling or using bottled water is advisable whenever test results exceed safe limits.
Maintenance & Troubleshooting
Routine Maintenance
Idaho DHW recommends regularly inspecting the wellhead and surroundings:
- Ensure sanitary cap and casing intact (≥18" above ground), surface runoff slopes away
- Check that valves prevent backflow
- Keep fertilizers, animal pens, septic fields well away from well
- Test water for bacteria/nitrates every 6-12 months
- Inspect pressure tank annually (check air charge/condition)
- Replace filters as recommended; most submersible pumps last 10-20 years
Warning Signs of Well Problems
Common red flags:
- Water becomes cloudy, discolored (rusty/brown), has foul taste/odor (sulfur "rotten egg")
- Low water flow or pressure, pump constantly cycling on/off, sudden loss of water
- Repeated positive bacteria tests
- Unexplained plumbing corrosion or sudden hardness changes
- Any unexplained change in water temperature, taste, odor, or sediment
Find a Licensed Driller
Only a licensed driller may perform well work per Idaho Code §42-238 and IDAPA 37.03.10.
Search Licensed Drillers in Idaho
Find Drillers Near You →How to Verify a Driller
- Ask for their IDWR license number
- Search IDWR's Licensed Well Drillers directory (by county)
- Get 2-3 written quotes
- Ask for references from recent jobs
- Confirm driller will handle permit application
Resources & Contacts
Additional Contacts
- Southwest District Health (Nampa/Twin Falls): 208-455-5400 (Covers Canyon, Owyhee, Elmore, etc. - testing services and guidance)
- DEQ Regional Offices: Boise 208-373-0426, Coeur d'Alene 208-666-4620, Idaho Falls 208-528-2629, Pocatello 208-236-6160, Twin Falls 208-736-2190
Key Regulatory References
- Idaho Code §42-235 – Drilling permits, $75 domestic fee
- Idaho Code §42-238 – Driller licenses, $200 fee
- IDAPA 37.03.09 – Well Construction Standards
- IDAPA 37.03.10 – Driller Licensing Rules
Certified Testing Labs
Have water samples analyzed only at state-certified labs. The Idaho Bureau of Laboratories (Caldwell, 208-334-2235) is the state lab. Several private labs are accredited as well, such as Analytical Laboratories (Boise, 208-342-5515). Homeowners can also submit samples via their local health district courier to the state lab.
Frequently Asked Questions
Are You a Licensed Driller?
Check out our compliance reference for Idaho drilling regulations, forms, and requirements.
Idaho Driller Compliance Guide →Sources & References
All information on this page is sourced from official Idaho government agencies:
- Idaho Department of Health and Welfare - Drinking Water and Private Wells
- Idaho Department of Water Resources - Wells
- Idaho Code §42-235 - Drilling Permits
- Idaho Code §42-238 - Well Drillers' Licenses
- Idaho DEQ - Groundwater Quality
- Central District Health - Well Guidance and Water Quality
- IDAPA 37.03.09 - Well Construction Standards Rules
- IDWR Licensed Well Drillers Directory