Always use a state-certified laboratory for private well water testing. Certification ensures the lab follows EPA-approved analytical methods, participates in quality assurance programs, and produces legally defensible results.

National mail-in labs

Several accredited mail-in labs serve all 50 states and send sample collection kits directly to your home:

Recommended — Tap Score (SimpleLab)

Certified lab · plain-language results delivered online

Order a Tap Score Test →

National Testing Laboratories

Visit Site →

WaterCheck

Visit Site →

Find a lab in your state

We've researched and confirmed certified labs in the states below. Pick your state to jump to its list.

California 155 labs Florida 8 labs Georgia 7 labs Michigan 12 labs Minnesota 11 labs North Carolina 6 labs New Jersey 11 labs New York 19 labs Ohio 8 labs Pennsylvania 7 labs Texas 12 labs Virginia 14 labs Vermont 7 labs Wisconsin 18 labs

California

1 Laboratories, Inc. (Los Angeles County)
49er Water Laboratory (Amador County)
A & R Laboratories, Inc. (San Bernardino County)
Abalone Coast Analytical, Inc. (San Luis Obispo County)
Advanced Technology Laboratories (Los Angeles County)
AEMTEK, Inc (Alameda County)
AEMTEK, INC. (Stanislaus County)
AIH Laboratory, Inc. (Orange County)
Alameda County Public Health Laboratory (Alameda County)
Alliance Technical Group, LLC - Tustin (Orange County)
Alpha Analytical Laboratories Inc. - North Bay (Sonoma County)
Alpha Analytical Laboratories, Inc. (Alameda County)
Alpha Analytical Laboratories, Inc. (Sacramento County)
Alpha Analytical Laboratories, Inc. - Los Angeles (Los Angeles County)
Alpha Analytical Laboratories, Inc. - San Diego (San Diego County)
Alpha Analytical Laboratories, Inc. - Ukiah (Mendocino County)
Alpha Scientific Corporation (Los Angeles County)
Anachem Laboratories, LLC (Los Angeles County)
Analytical Environmental Lab, LLC (San Diego County)
Applied Industrial Microbiology, Inc. (San Diego County)
Applied Microbiological Services (AMS) (Los Angeles County)
AQ Environmental Laboratories, LLC (Los Angeles County)
AQUA-Science LLC (Yolo County)
Aquatic Bioassay & Consulting Laboratories, Inc. (Ventura County)
Aquatic Testing Laboratories (Ventura County)
Asbestos TEM Laboratories, Inc (Alameda County)
ASSET Laboratories (Los Angeles County)
ASSET Laboratories (Sacramento County)
ATEL, LLC (San Bernardino County)
Babcock Laboratories, Inc. (Riverside County)
Bend Genetics LLC (Sacramento County)
Bracewell Engineering, Inc. (Santa Clara County)
Brawley Analytical, Inc. (Imperial County)
Brelje and Race Laboratories, Inc. (Sonoma County)
BSK Associates (Fresno County)
BSK Associates - Bakersfield Analytical Laboratory (Kern County)
California Laboratory Services (Sacramento County)
Caltest Analytical Laboratory (Napa County)
Capco Analytical Services (Ventura County)
Cel Analytical, Inc. (San Francisco County)
Central Valley Laboratories (San Joaquin County)
Ceres Analytical Laboratory, Inc. (El Dorado County)
Certified Laboratories (Santa Clara County) →
Certified Laboratories - Turlock (Stanislaus County)
Chemical Waste Management, Inc. (Kings County)
Clean Harbors San Jose, LLC (Santa Clara County)
Clinical Laboratory of San Bernardino II (Santa Barbara County)
Clinical Laboratory of San Bernardino, Inc. (San Bernardino County)
CM Analytical, Inc. (Santa Clara County)
Continental Water Laboratory (Sacramento County)
County of San Luis Obispo Public Health Laboratory (San Luis Obispo County)
Cranmer Engineering, Inc. (Nevada County)
Datalab (Santa Clara County)
Dellavalle Laboratory, Inc. (Fresno County)
Denele Analytical, Inc. (Yolo County)
Drinking Water & Well Water Testing - Environmental testing and analysis labs, ELAP, NADCAP accredited | Pat Chem Laboratories → Drinking Water Testing Laboratory — Babcock Laboratories, Inc. → Drinking, Well Water Testing Analysis Lab | California Laboratory Services →
Dysert Environmental, Inc. (San Mateo County)
EMAX Laboratories, Inc. (Los Angeles County)
EMSL Analytical Inc. (Alameda County)
EMSL Analytical, Inc. (San Diego County)
EMSL Analytical, Inc. (LA Testing) (Los Angeles County)
Enviro-Chem, Inc. (Los Angeles County)
Envirocheck, Inc. (Orange County)
Environmental Laboratory Network, Inc. (San Diego County)
Environmental Support Technologies (Orange County)
Eurofins Built Environment Testing West - Glendale, CA (Los Angeles County)
Eurofins Built Environment Testing West - Pomona, CA (Los Angeles County)
Eurofins Built Environment Testing West - Sacramento, CA (Sacramento County)
Eurofins Built Environment Testing West -Tustin, CA (Orange County)
Eurofins Built Environment Testing West, LLC (Alameda County)
Eurofins Built Environment Testing West-Burlingame (San Mateo County)
Eurofins Built Environment Testing West-San Diego, CA (San Diego County)
Eurofins Microbiology (Orange County)
Eurofins Pomona (Los Angeles County)
Eurofins Sacramento (Yolo County)
Eurofins Tustin (Orange County)
Food Microbiological Laboratories, Inc. (Orange County)
Fruit Growers Laboratory, Inc. (Butte County)
Fruit Growers Laboratory, Inc. (San Joaquin County)
Fruit Growers Laboratory, Inc. (Ventura County)
Fruit Growers Laboratory, Inc. (San Luis Obispo County)
Fruit Growers Laboratory, Inc. (Tulare County)
Garratt-Callahan Laboratory (San Mateo County)
Geo-Monitor, Inc (San Bernardino County)
Getting Your Water Tested $200
H2O Molecular (San Diego County)
Humboldt County Public Health Laboratory (Humboldt County)
Imperial County Public Health Laboratory (Imperial County)
Institute of Environmental Health, Inc. dba IEH-JL Analytical (Stanislaus County)
Inyo County Water Lab (Inyo County)
JK BioScience Inc. (Los Angeles County)
Jones Environmental, Inc. (Los Angeles County)
K Prime, LLC. (Sonoma County)
LA Testing (Orange County)
Lodi Wine Laboratories (San Joaquin County)
Long Beach Public Health Laboratory (Los Angeles County)
Los Angeles County Public Health Laboratory (Los Angeles County)
MBC Aquatic Sciences (Orange County)
McCampbell Analytical, Inc. (Contra Costa County)
Metropolitan Solutions (San Diego County)
Michelson Laboratories, Inc. (Los Angeles County)
Microbac Laboratories, Inc. - Arcata (Humboldt County)
Microbac Laboratories, Inc. - Turlock (Stanislaus County)
MicroTest Laboratories, Inc. (Sacramento County)
Montecito Sanitary District Laboratory (Santa Barbara County)
Monterey Bay Analytical Services, Inc. (Monterey County)
Monterey County Consolidated Environmental Laboratory (Monterey County)
Moore Institute for Plastic Pollution Research (Los Angeles County)
Moore Twining Associates, Inc. (Fresno County)
Napa-Solano-Yolo-Marin Public Health Laboratory (Solano County)
Nautilus Environmental, Inc. (San Diego County)
Oilfield Environmental & Compliance Inc. (OEC) (Santa Barbara County)
Onterris Laboratories, LLC (Orange County)
Onterris Laboratories, LLC (El Dorado County)
Onterris Laboratories, LLC - Anaheim (Orange County)
Optimal Technology, LLC (Ventura County)
Orange County Public Health Laboratory (Orange County)
Pace Analytical Services, LLC - Redding (Shasta County)
Pace Analytical Services, LLC dba BC Laboratories, Inc. (Kern County)
Pacific EcoRisk (Solano County)
Pat-Chem Laboratories (Los Angeles County)
PEL Laboratories LLC. (Shasta County)
Performance Analytical Laboratories, Inc. (Los Angeles County)
Positive Lab Service (Los Angeles County)
Precision Enviro-Tech (San Joaquin County)
Precision Enviro-Tech (Tuolumne County)
Professional Water Test Lab | Drinking Water Testing Service in CA →
Safe Food Alliance (Fresno County)
San Diego County Public Health Laboratory (San Diego County)
San Joaquin County Public Health Laboratory (San Joaquin County)
San Mateo County Public Health Laboratory (San Mateo County)
SGS Forensic Laboratories (Los Angeles County)
SGS North America (Alameda County)
SGS North America, Inc. (Fresno County)
Sierra Analytical Labs, Inc. (Orange County)
Sierra Dairy Laboratory (Tulare County)
Sonoma County Public Health Laboratory (Sonoma County)
Sparger Technology, Inc. (Sacramento County)
Strata -Analysts Group, Inc. (Los Angeles County)
SunStar Laboratories, Inc. (Orange County)
Torrent Laboratory, Inc (Santa Clara County)
Ventura County Public Health Laboratory (Ventura County)
Water Quality Testing & Analysis: Residential & Commercial Supply Testing for Contaminants & Heavy Metals in San Diego, Orange County and Bay Area | Vert Environmental → Water Quality Testing Labs - Cal Water → Water Testing for Private Wells - Sonoma County Emergency →
Weck Laboratories, Inc. (Los Angeles County)
Well Water Testing California | Certified Laboratory ... → Well Water Testing – Why It's So Important →
Western Analytical Laboratories, Inc. (San Bernardino County)
World Oil Recycling (Los Angeles County)
WSP Microbiological & Molecular Services Laboratory (San Diego County)
WSP USA Inc. (San Diego County)
Zalco Laboratories, Inc. (Kern County)

Florida

AEL Online Ordering - Drinking Water and Private Well ... → Drinking Water Bacteria Testing - Everglades Laboratories, Inc. (Glades County) → Drinking Water Sampling | Phoslab Testing Laboratories Phoslab Testing Laboratories → Marion County Lab | Ocala, FL (Marion County) → Private Well Water Testing - Florida Department of Health $30 Urgent Water Testing Florida - FL → Water Quality Lab & Testing - Lake County Government (Lake County) → Water Testing Cost Florida | Drinking & Well Water Testing →

Georgia

AESL Water Analyses → Lab & Field Services → Non-Public Water Supply Testing Guidance → Private Wells - Cumming Utilities → Well Water Testing Dublin GA | Certified Lab Analysis Laurens ... (Laurens County) $75 Well Water Testing of Georgia by U.S.Water & Air → Well Water Testing Service in Chatham County (Chatham County) →

Michigan

Drinking Water Testing Services | Paragon Laboratories | Livonia, MI → Home Water Testing | AquaTest Laboratories → Home | B.E.S.T. Labs, Inc. → Laboratory - Prein&Newhof → Michigan Well Water Testing & Inspections → Michigan Well Water Testing - Water Test, FHA VA & USDA Water Testing → Pricing | Great Lakes Water Quality Lab → Private Well Water Testing Services for Michigan Residents - Advanced ... (Oakland County) → Trace Analytical Laboratories, Inc → Water Analysis | Michigan Water Testing Lab → Water Quality Testing for Wells - Livingston County, MI (Livingston County) → Well Testing Services | Raven Analytical Laboratories →

Minnesota

Certifications & Memberships - Minnesota Valley Testing Laboratories, Inc. → Engel Water Testing | Home → Home | AW Research Laboratories → Instrumental Research Water Testing Labs → Order Water Tests - Minnesota Well Owners Organization → Rural Health and Drinking Water - Freshwater Society → Twin City Water Clinic | Well Water Testing | Minnesota & Wisconsin → Water Quality Testing | Natural Resources Research Institute → Water Tests | Washington County, MN - Official Website (Washington County) → Well Water Testing (Fillmore County) $60 Well Water Testing | Anoka County, MN - Official Website (Anoka County) →

North Carolina

Drinking Water Laboratories | NC DEQ → North Carolina Water Testing Labs: Find EPA-Certified Laboratories | TapWaterData → Update on Well Water Testing Resources in Western NC | NC State Extension → VA, FHA & USDA Certified Well Water Testing North Carolina - Clean Water Labs → Wake County Water Quality Lab | Wake County Government (Wake County) → Water Testing | Orange County, NC (Orange County) →

New Jersey

Department of Environmental Protection - Lab Finder → Drinking Water Testing and Sampling in New Jersey → Environmental Well Testing: Well Water Testing Services | New Jersey $925 Home | Garden State Labs - Environmental Laboratory - New Jersey, USA → New Jersey Home Water Testing Services - RAdata → New Jersey Private Well Testing Act PWTA - EMSL → Olympian Water Testing™ | NY, NJ & CT | NELAP Accredited ... → SJ Water Test | → Water Testing Laboratory - ACUA → Water Testing | Environmental Laboratory Network Ringwood NJ → Well Testing - Raritan Headwaters →

New York

Capital Region Environmental Lab: New York Potable Water Testing → Cornell Cooperative Extension | Labs for Testing Your Drinking Water (Tompkins County) → Cornell Cooperative Extension | Well Water (Saratoga County) → Cornell Cooperative Extension | ​Water Testing Drop off Sites (Cayuga County) → Drinking Water Quality & Private Well Testing (Greene County) → Drinking Water Testing — Agricultural Analytical Services Lab → How to get your Drinking Water Tested in Hudson Valley New York and Connecticut - York Lab → I want to test my water | Community Science Institute → Lab Price List - MVWA $15 Laboratory - Upstate Freshwater Institute → NY Water Testing Labs for Food Safety Use → Olympian Water Testing™ | NY, NJ & CT | NELAP Accredited ... → Private Drinking Water | Tompkins County (Tompkins County) → Private Well Water Testing Program - Suffolk County Government (Suffolk County) → Search NY Labs - Current scope as of → Well Water - Cornell Cooperative Extension (Oneida County) → Well Water - Cornell Cooperative Extension Onondaga County (Onondaga County) → Well Water Sampling Program - Cornell Cooperative Extension (Ontario County) $51 Well Water Testing | Binghamton, Ithaca, Cooperstown & Cortland, NY →

Ohio

Drinking Water | Brookside Laboratories, Inc. → EPA-Certified Water Testing • Water Treatment • Q Laboratories → Home | Jones & Henry Laboratories, Inc. → Ohio Water Test Kits - drinkingwaterlabs.com → Water Quality - Ohio Department of Health - Confirmed Labs → Water Testing Services from Benchmark Labs | Columbus, Ohio → Watercheck - NTL - Residential & Commercial Water Testing → Where to Have Your Water Tested | Ohioline - Ohio State University →

Pennsylvania

CERTIFIED WATER TESTING Fast, Accurate, DEP-Accredited → Drinking Water Testing (Agricultural Analytical Services Lab) → Drinking Water Testing - Pike County, PA (Pike County) → Laboratory, Analytical & Biological Services (Labs), Inc New Oxford → Private Well Water Water Testing Pennsylvania Certified Laboratories ... → Water Testing Laboratory - ABE Laboratories → Water Testing | Department of Environmental Protection - PA.GOV →

Texas

Accreditations & Certifications | Eastex (Austin County) → Aqua-Tech Laboratories | Accredited Water Testing Lab | Austin | Bryan → Bio Chem Lab: Central Texas Water Testing Services → Drinking Water Testing - Ablabs (King County) → Laboratory Information - ANRA (Angelina County) → Private Well & Drinking Water Tests | NET Health Lab → Residential Water Supply Testing - Austin → Resources for Sampling Private Water Wells → Water Lab | Brazoria County, TX (Brazoria County) → Water Quality Testing - Galveston County Extension (Galveston County) → Water Testing (Tarrant County) → Watercheck - NTL - Residential & Commercial Water Testing →

Virginia

Accreditation & Certifications - Prince William Water → Biotech Laboratory LLC → E coli water testing labs in Virginia tri-state area 1-800-582-5211 → Home Water Quality | Virginia Cooperative Extension | Virginia Tech → Household Water Quality Testing Program | Loudoun County, VA (Loudoun County) $70 Mid-Atlantic Laboratories → Private Well Water Testing - Virginia Environmental Resources → VA, FHA & USDA Certified Well Water Testing North Carolina - Clean Water Labs → Virginia Household Water Quality Program - Virginia Tech $70 Water Quality Laboratories Certified in West Virginia → Water Quality Testing - Southern Brothers Inspections → Water Testing - Sampling & Analysis - Conventional, VA, FHA, Day Care $170 Water Testing Near Me | MD, DC & Northern Virginia $150–$400 Well water testing in Central Virginia, VA (Frederick County) →

Vermont

Certified Laboratories for Landowner Water Quality Testing → Commercial and Residential Water Testing $159 Drinking Water Testing | Vermont Department of Health → Vermont State Drinking Water → Virginia Household Water Quality Program - Virginia Tech → Well Water Testing in New England | Dartmouth Toxic Metals → Well Water Testing in Vermont: What to Test For →

Wisconsin

Certifications - White Water Associates → Clean Water Testing → Private and Public Well Water Tests | Kenosha County, WI (Kenosha County) → Private Well Water Quality and Laboratory Services (Waukesha County) → Water Quality Testing by TG Analytical Laboratories → Water Quality Testing | Bayfield County, WI - Official Website (Bayfield County) → Water Testing - Extension Oneida County (Oneida County) → Water Testing for Private Wells - Vernon County (Vernon County) $30 Water Testing | Green County, WI (Green County) → Well Water Test Kits | Door County, WI (Door County) $30 Well Water Testing - Drinking Water - Rusk County, WI (Rusk County) → Well Water Testing - University of Wisconsin-Stevens Point → Well water testing in Wisconsin → Well Water Testing Initiatives Polk County WI (Polk County) → Well Water Testing – Extension Oconto County (Oconto County) $68 Wisconsin Certified Water Testing Laboratory → Wisconsin State-Certified Water Testing Laboratory → Wisconsin Water Tests Kits - drinkingwaterlabs.com →

What to look for in a lab