Private water well permits and regulations are set almost entirely by state and county authorities, not the federal government, so where you drill determines what paperwork, construction standards, and water testing apply. The Safe Drinking Water Act only covers public water systems serving at least 15 connections or 25 people, which puts your backyard well outside federal oversight.1Office of the Law Revision Counsel. 42 USC 300f – Definitions The practical consequence: a state agency or county health department writes the rules you have to follow, and the responsibility for keeping the water safe sits with you.
Who Sets the Rules
The EPA does not regulate private drinking water wells. Its National Primary Drinking Water Regulations under 40 CFR Part 141 set maximum contaminant levels for public water systems and have nothing to do with private well construction, setback distances, or testing.2eCFR. 40 CFR Part 141 – National Primary Drinking Water Regulations The CDC states plainly that “government officials do not regulate, treat, or monitor tap water from private wells.”3Centers for Disease Control and Prevention. Guidelines for Testing Well Water
In their place, state environmental agencies, state departments of natural resources, and county health departments decide how deep the well must be, how far it has to sit from contamination sources, what casing and grout materials the driller can use, and whether water testing is required before you turn on the faucet. Rules vary considerably. Some jurisdictions have detailed construction codes and mandatory testing; others have minimal oversight. Your county health department or state water agency is the first call for every step that follows.
Getting a Well Permit
Nearly every jurisdiction requires a permit before anyone drills. Applications go to the county health department, state water board, or environmental agency. Exact requirements differ, but most applications share the same core elements:
- Site plan. A plot plan showing property boundaries, the proposed well location, and existing structures including the house, septic system, and any chemical storage.
- Setback verification. Proof the proposed location meets minimum distances from contamination sources. Most jurisdictions require at least 50 feet from a septic tank and 100 feet from septic drain fields, though local rules may set different distances.
- Driller credentials. The name and license number of your drilling contractor. Most states require drillers to hold a state license.
- Well specifications. Estimated depth, the aquifer being targeted, and planned casing material.
- Water usage estimate. Projected daily demand, which helps regulators track withdrawal from local groundwater reserves.
Permit fees commonly fall in the range of a few hundred dollars. Incomplete or inaccurate applications cause the most delays. Once the reviewer confirms your site plan meets setback and construction requirements, the permit is issued and authorizes the driller to begin.
Construction and Inspection Standards
Construction starts with heavy drilling equipment boring down to the target aquifer. The driller sets a steel or PVC casing inside the borehole to keep soil and rock from collapsing and to create a clean conduit for the water. The space between the outside of the casing and the borehole wall, called the annular space, has to be sealed with a cement-based grout or bentonite clay. That seal is one of the most important parts of the entire well, because it stops surface water, pesticides, and bacteria from running down alongside the casing and reaching the aquifer.
After the casing and grout are in place, the contractor installs a submersible pump and finishes the wellhead with a sanitary cap. Most jurisdictions require the casing to extend at least 12 inches above the surrounding ground to keep debris, insects, and floodwater out. The ground around the wellhead should slope away so water doesn’t pond.
A local health official or well inspector then verifies that the finished well matches the permitted plans. The inspector checks the grout seal, measures casing height, confirms setback distances, and reviews the driller’s log. If the construction doesn’t meet code, the owner is typically ordered to fix the defects before the permit can be closed. A successful inspection produces a construction completion report confirming the well is sound and ready for water quality testing.
Testing Your Water
This is where the absence of federal oversight shows most clearly. The EPA recommends that private well owners test annually for total coliform bacteria, nitrates, total dissolved solids, and pH, but those are recommendations rather than enforceable mandates.4U.S. Environmental Protection Agency. Protect Your Home’s Water Whether testing is legally required before you occupy a home with a new well depends on state and local rules. Many jurisdictions require at least a coliform and nitrate test before closing a construction permit or issuing an occupancy permit; some don’t.
When testing is required, you have to use a state-certified laboratory. Your county health department can provide a list of certified labs.3Centers for Disease Control and Prevention. Guidelines for Testing Well Water A basic potability panel covering bacteria and nitrates is often under $100. Comprehensive panels screening for dozens of contaminants, including arsenic, lead, radon, and volatile organic compounds, run several hundred dollars.
The CDC advises well owners to ask their local health or environmental department whether they should test for arsenic, a naturally occurring contaminant in many regions that can cause serious health effects at levels you can’t taste or smell.3Centers for Disease Control and Prevention. Guidelines for Testing Well Water Other contaminants worth asking about include lead if your plumbing has older fixtures, radon in areas with known geological deposits, and pesticides or fertilizers near agricultural land.
If the Water Fails a Test
A positive coliform result is the most common failure, and it doesn’t necessarily mean your well is permanently compromised. The standard first step is a confirmation sample, since sampling technique causes a fair number of false positives. If contamination is confirmed, switch to bottled or boiled water for drinking and cooking until the well is cleared.
Before treating the water, you need to find the source. A licensed well professional should inspect the wellhead cap, casing seal, and surrounding area for damage or surface water intrusion. Standing water near the wellhead, a cracked cap, or a failing grout seal are common culprits. Once the physical problem is corrected, the standard remediation is shock chlorination: a concentrated chlorine solution is introduced into the well, run through every household faucet until chlorine odor appears, and left to sit for 8 to 24 hours. After flushing, you wait about two weeks and retest.
If bacteria return after a second round, the groundwater source itself may be contaminated. Options at that point include a continuous disinfection system, drilling deeper into a cleaner aquifer, or connecting to a public water supply if one is reasonably close. Nitrate contamination is harder to fix because it usually reflects regional agricultural activity and doesn’t respond to chlorination. Reverse osmosis or ion exchange is the typical household treatment for high nitrates.
Ongoing Maintenance
A well isn’t a set-and-forget system. The National Ground Water Association recommends an annual evaluation by a licensed professional. A thorough checkup includes a flow test, water-level readings before and during pumping, an assessment of pump motor performance, inspection of the pressure tank and switch, and a visual confirmation that the wellhead is sanitary and above grade.
Water quality testing should happen at least once a year for total coliform bacteria and nitrates, plus any contaminants of local concern such as iron, manganese, or sulfides.4U.S. Environmental Protection Agency. Protect Your Home’s Water Test immediately if you notice a change in taste, odor, or appearance, or after any service work on the well or pump. Cloudy water, visible bacterial growth on fixtures, and malfunctioning treatment devices all warrant a test before drinking.
Neglect isn’t just a health risk. A failing pump or corroded casing caught early might cost a few hundred dollars to repair. Ignored long enough, the same issue can turn into a full well replacement at tens of thousands of dollars.
Groundwater Rights and Pumping Limits
Owning the land doesn’t give you unlimited rights to the water underneath it. States follow different legal doctrines. Under the rule of capture, a landowner can pump freely from beneath their property even if it affects neighboring wells. Prior appropriation, common in western states, awards priority based on who first put water to beneficial use. Some eastern states apply reasonable-use rules that allow pumping as long as it doesn’t unreasonably harm others drawing from the same aquifer.
Regulators can also impose additional restrictions. Many states require minimum spacing between wells to keep neighbors from drawing down the same pocket of groundwater too quickly. During declared drought emergencies, agencies can restrict or ban non-essential water use even for private well owners, including lawn watering and car washing. Violating pumping restrictions or building a well without authorization can lead to administrative fines, mandatory well closure, or both.
Wells, Home Sales, and Shared Systems
If you’re buying or selling a property served by a private well, the well adds a layer to the transaction. There is no universal federal requirement to test at the point of sale, but many states and local jurisdictions require it,5Environmental Protection Agency. What Every Realtor Should Know About Private Drinking Water Wells and the buyer’s lender almost certainly will.
FHA-insured loans have specific rules. The lender must confirm whether connecting to a public water system is feasible at a reasonable cost, with HUD using a benchmark of 3 percent or less of the property’s estimated value. If a public connection isn’t reasonable, the individual well is acceptable as long as it meets local health department requirements. Where local standards don’t exist, the water must meet EPA maximum contaminant levels.6U.S. Department of Housing and Urban Development. HOC Reference Guide – Water Systems: Individual Water Systems FHA also prohibits wells located inside the foundation walls of a home, except in arctic regions.
The EPA recommends that sellers have the well tested and inspected before listing. Identifying problems early avoids delays, improves marketability, and reduces the chance of a deal collapsing over a failed water test.5Environmental Protection Agency. What Every Realtor Should Know About Private Drinking Water Wells The pump, pressure tank, treatment systems, and the wellhead area should all be inspected along with the water itself.
When two or more properties draw from the same well, a written agreement is essential. It should establish recorded easements in each property deed guaranteeing access for maintenance, repair, and testing; spell out how electricity, pump replacement, testing, and repair costs are divided; make each user responsible for their own service line; and allow any party to request testing at any time. Usage restrictions, a dispute resolution clause, and provisions for what happens if the well owner sells all belong in the document. For FHA-backed mortgages, a shared well can serve no more than four living units or properties, must demonstrate adequate flow, and must have a shut-off valve on each dwelling’s service line so water can be cut to one home without affecting the others.6U.S. Department of Housing and Urban Development. HOC Reference Guide – Water Systems: Individual Water Systems
Decommissioning an Old Well
An unused well is a direct pathway for surface contaminants to reach the aquifer that may supply your neighbors. Old, unplugged wells have been documented causing dozens of groundwater contamination incidents nationally. Most states require that unused wells be properly sealed, and some impose fines on property owners who leave them open.
Proper decommissioning removes all equipment, pumps, and debris from the well, disinfects it with a chlorine solution, and then fills the entire well column from bottom to surface with approved sealing materials such as neat cement grout or bentonite that meet established standards. The casing is pulled or cut off at least two feet below ground level, and the top is sealed and mounded with soil to shed water. A licensed well driller usually has to perform the work, and the person doing it is responsible for submitting a well closure report to the relevant agencies.7Natural Resources Conservation Service. Conservation Practice Standard – Well Decommissioning (Code 351) Professional decommissioning typically costs between $500 and $5,000 or more depending on depth, diameter, and condition.
What to Expect to Spend
Drilling a residential well generally costs between $25 and $65 per foot in most areas, though hard rock formations like granite can push costs above $100 per foot. A 200-foot well at average rates runs roughly $5,000 to $13,000 for the borehole, casing, and basic well development. The pump, pressure tank, electrical wiring, and plumbing connections typically add another $2,000 to $6,000.
Beyond construction, budget for the permit fee, commonly a few hundred dollars, and initial water testing. A basic potability panel is under $100 at most certified labs; a comprehensive panel covering 50 or more contaminants runs $100 to $200 or more. Annual maintenance inspections add a recurring cost, but they’re cheap insurance against an emergency pump replacement or a contamination event that makes the water unusable.