30 Questions to Ask a Well Drilling Contractor Before You Sign

How to Use This Guide

Print this page. The checklists below print with empty checkboxes and crisp borders, so you can bring the same 30 questions to every bid meeting and compare answers side by side.

Roughly 43 million Americans drink from private wells, and because the federal Safe Drinking Water Act does not cover them, construction quality and water safety are entirely the homeowner's problem. Your single biggest lever is who you hire: the driller chooses the casing, the seal, the depth, and the testing that determine whether your water is safe for the next 30 to 50 years. A good contractor answers all 30 of these questions in stride - what the list really does is expose the unlicensed, the underinsured, and the lump-sum optimist before any equipment shows up. Get itemized bids from two or three licensed well drillers near you and run every one through the same list.

Seven of these questions carry more weight than the rest: license verification, proof of insurance, grouting, the rock clause, the dry hole policy, the pump test, and the well log. For those, the sections below also spell out why the question matters and what a red-flag answer sounds like, so you recognize the dodge in real time. For the wider process - shortlisting, bid comparison, timing - start with our guide to hiring a well drilling contractor.

Licensing, Insurance, and Permits

Because the EPA does not regulate private wells, state licensing and the contractor's insurance are the only safety net under your project. Verify both before you discuss a single foot of drilling.

Why the license question matters.Most states require a specific water well contractor license - California's C-57 is the classic example - and a general contractor's license does not substitute. A good answer sounds like: "My state license number is X, you can verify it with the licensing board, and I am an NGWA-certified member." A red-flag answer sounds like: "The state doesn't really enforce licensing for rural residential wells," or "I operate under my general contractor's license." Both mean walk away. Verification portals for all 50 states are in our well driller licensing guide, and state-specific construction rules live in the state well guides.

Why the insurance question matters.If a worker is hurt on your land and the contractor carries no workers compensation, the claim can land on you as the property owner. And Inland Marine coverage is the piece most homeowners have never heard of: it insures the rig and tools in transit and on your site, which standard auto and property policies do not. A good answer names all three coverages and offers a COI without being pushed. The red flag: "I'm a one-man operation, so I don't need workers comp" - or any hesitation about producing the certificate.

Local Experience and Geological Knowledge

Groundwater is not an underground lake - it fills the pores and fractures of local rock, and conditions change wildly over short distances. You are hiring knowledge of YOUR square mile.

A contractor who drilled three wells in your subdivision last year can tell you the granite starts around 150 feet and the fractured-bedrock aquifer below it runs about 10 GPM. One who has never worked your county is guessing - with your money. You can check the claims yourself: DrillerDB's well mapshows real reported depths, geology, and yields for millions of neighboring wells, so you walk into the interview already knowing what nearby wells look like. If an answer to question 6 contradicts every logged well within a mile, you have learned something important about the bidder. And question 8 is not paranoia: the right fix for a known local contaminant is often a siting or depth decision made before drilling, not a filter bolted on after. The red-flag answer is "groundwater is naturally filtered, it's always safe straight from the tap."

Drilling Method and Materials

These five questions decide the lifespan of the well. The materials going into the ground - casing, grout, screen - are invisible the day after drilling and nearly impossible to fix later.

Why the grouting question matters most in this group.The annular space - the gap between the casing and the raw borehole wall - is a direct elevator shaft from your lawn to your drinking water if it is left open. Properly done, the contractor pressure-pumps bentonite clay or neat cement grout from the bottom up, and most state codes demand at least the top 20 feet be sealed. A good answer describes that procedure specifically. The red-flag answer is some variation of: "We dump dry concrete mix down the hole and let the groundwater harden it" - a shortcut that leaves voids where surface bacteria and pesticides ride straight down the outside of the casing.

You do not need to become a drilling engineer - you need the contractor to commit to specifics in writing. For background, see the well drilling methods guide and our drilled well guide, which walks through every component above. One surface detail worth confirming: the casing should stand at least 12 inches above finished grade under a bolted, vermin-proof cap - never "cut flush so you can mow over it."

The Bid: Pricing and Financial Protections

Geology is the one thing nobody controls, so the bid's job is to decide IN ADVANCE who pays when the ground surprises everyone. Two clauses - rock and dry hole - do most of that work.

Why the rock clause matters.A rock clause names, in advance, the higher per-foot rate that applies if the bit hits unexpected hard rock - typically an increase of $10 to $20 per foot to cover bit wear and slower progress. Without one, you are negotiating with a contractor whose rig is parked over a half-finished hole on your property, which is not a negotiation. A good answer sounds like: "$30 per foot in clay and sand, $55 in solid bedrock, and I notify you before proceeding if we hit rock." The red flag is a refusal to discuss the possibility at all - the same contractors who "never hit rock" are the ones who demand massive uncontracted upcharges mid-hole.

Why the dry hole policy matters.Run the numbers on a 300-foot well quoted at an optimistic $30 per foot: $9,000. Hit granite with no rock clause and the rate doubles - $18,000. If that hole then yields no water and there is no dry-hole provision, you owe the full amount for a legally abandoned hole and still need well number two. The fair terms: a discounted dry-hole rate (often 30% to 50% off the per-foot price) or a flat mobilization fee, with the contractor handling state-compliant abandonment. Beware the opposite pitch - "I guarantee water or you don't pay" usually means a 1 GPM trickle will be declared a success.

If the totals are intimidating, you have options beyond the cheapest bid - including USDA programs for eligible rural homeowners. Our well drilling financing guide compares them, and the contracts guide covers the clause-by-clause fine print these five questions feed into.

Yield Testing and Water Quality

Hitting water is half the job. The other half is proving the well can sustain your household and that the water is safe - and both are testable before the contractor gets final payment.

Why the pump test duration matters.A yield test draws the water level down and measures how fast the aquifer refills the borehole. Done honestly, that takes hours - 2 to 12 is the residential range, and some codes mandate a sustained 4-hour test. Done dishonestly, it takes 20 minutes: just long enough to pump out the water already stored in the borehole and call the gusher a yield. A good answer: "We run a minimum 4-hour stabilized drawdown test and confirm the recharge rate matches the pumping rate." The red flag: "I can tell the yield by how much water blows out of the hole while we drill."

On question 21: the CDC recommends private well owners test at least annually for coliform bacteria and nitrates, and the contractor's certified lab panel at handover is the baseline every future test gets compared against. Keep it with the well log, and see our well water testing guide for the ongoing schedule.

Site Logistics and Project Management

A drill rig is a rolling industrial plant that can weigh 60,000 pounds loaded. Four questions protect your driveway, your septic system, and your schedule.

The pattern to listen for here is candor. "Don't worry, my truck won't leave a mark" is a promise physics will break; the contractor who tells you exactly where the ruts will be and asks for your septic as-builts before quoting the route has done this hundreds of times. Question 23 has its own red flag: "we'll squeeze you in whenever we have a free afternoon" describes a contractor who will leave a half-cased hole on your property between other jobs.

Aftercare, Warranties, and the Well Log

The relationship should not end when the rig leaves. The last four questions secure the paperwork, the warranty, and the phone number you will need at 9 PM on a holiday weekend.

Why the well log question matters.The well log is the legal record of what was built: total depth, casing and screen specs, the geological layers encountered, and the static water level on completion day. Every future repair starts with it, and real estate transactions frequently require it. Many states (California, Massachusetts, and New York among them) mandate that the driller file it with the state and give the owner a copy, typically within 30 to 60 days. A good answer: "You get a physical copy and a PDF the same day I file with the state." The red flag: "Those logs are proprietary company secrets." They are not - they are your well's birth certificate. DrillerDB's database of 17.8 million well records exists because these logs are public infrastructure; you can look up existing well records here.

Keep reading

• Hiring a Well Drilling Contractor: the full process from shortlist to signed contract
• Well Drilling Contracts: every clause your agreement must have
• Well Driller Licensing: verify a license in all 50 states
• Well Drilling Financing: USDA programs, loans, and real total costs
• Certified Well Drillers: what NGWA certifications actually mean