Colorado county well guide

Well Water in Grand County, CO: Testing, Contractors and Rules

About 474 households in Grand County, 8% of the county, rely on a private well. Nobody tests that water unless the owner does.

Labs within 40 milesLicensed contractors
8%of households on a private well
Share on wells, county vs state
Grand County8%
Colorado average11%
11licensed contractors serve the county
31 mito the nearest certified lab, Gilpin County Public Health Agency
Nostatewide test required when a home is sold

Roughly 8% of Grand County households, about 474, get their water from a private well rather than a utility. They are concentrated in the rural parts of the county, and they are on their own for testing.

Local rules for wells in Grand County

Colorado permits the well but not the water. In Grand County that means a DWR permit and a licensed driller, and no required water test at any point. The state’s recommendations and the free PFAS program are below.

At a glance

Water test for a new wellNot required statewide

A DWR well permit is required before drilling and contractors must notify DWR before construction, but no water quality test is required by the state.

Water test when a home is soldNot required statewide

No statewide requirement. Lenders often require a test; some counties recommend one at transfer.

What the state recommends

CDPHE recommends yearly testing for coliform bacteria and nitrate, and a broader panel (metals, uranium, radon, fluoride, hardness) every few years. Colorado groundwater commonly has naturally occurring uranium, radon and fluoride.

Free or low-cost testingAvailable

Colorado offers a free PFAS testing program for private wells. Several county health departments (Weld, El Paso, La Plata, Mesa, Pueblo, Routt, Gilpin, Northeast Colorado) run certified labs that accept homeowner samples.

Getting your water tested near Grand County

1 certified lab within 40 miles serve Grand County, starting with Gilpin County Public Health Agency in Black Hawk (about 29 miles from the county center). Each card below shows whether the lab takes homeowner samples and which tests it is certified for.

1 certified labs within 40 miles

Licensed well contractors serving Grand County

10 licensed contractors serve Grand County, including Burk Drilling Inc. and Cooper Drilling LLC. Each profile carries the state license number and the date we checked it, and the filters below sort them by drilling, pump work or treatment.

Well depth and water chemistry

What comes up with the water depends on the aquifer. A first full panel tells you which of them apply to your well.

Typical well depth

Varies by location. Check the state well record search for logs of nearby wells.

Contaminants to test for
  • Uranium
  • Radon
  • Fluoride
  • Nitrate
  • Hardness
  • Coliform bacteria
  • Arsenic (some basins)

Neighboring counties: Gilpin County, Clear Creek County, Summit County, Boulder County.

What well work costs in Grand County

Basic bacteria and nitrate test$25 to $75lab fee, homeowner sample
Full panel lab test$150 to $400metals, VOCs, radiologicals
Well inspection$250 to $550flow, pressure, visual, water test
Submersible pump replacement$1,200 to $4,500parts and labor
Pressure tank replacement$400 to $1,200installed
Whole-house treatment system$800 to $6,000softener, iron filter, UV, RO
New well drilled$5,500 to $25,000about $25 to $65 per foot
Shock chlorination$80 to $300or about $20 as a DIY job

National ranges from published 2025 to 2026 contractor pricing. Local quotes vary with depth, access and materials.

Questions Grand County well owners ask

How many homes in Grand County are on a well?

About 474, or 8% of households, based on Census housing data and state well surveys. The share is highest outside the towns with public water.

Where is the closest certified lab to Grand County?

Gilpin County Public Health Agency in Black Hawk, about 29 miles away. It accepts homeowner samples.

Do I need a permit to drill a well in Grand County?

Yes. A permit from the Colorado Division of Water Resources is required before any drilling.

What does a well test cost near Grand County?

A bacteria and nitrate test runs $25 to $75 at most certified labs; a full panel with metals is $150 to $400. County health department labs charge less than commercial labs, and PFAS testing is free through the state.