Extension Search / Soil Labs

Soil Testing Labs

Most states have a university soil lab that tests a mailed sample for pH and nutrients. Where there isn’t one, Extension says which tests to ask a private lab for. Either way, the test method matters: each state’s fertilizer guidelines are built on particular tests.

AL
Auburn University Soil, Forage & Water Testing Laboratory
Auburn University · Auburn
AK
Soil Testing in Alaska
No public lab, use a private one
AZ
Soil Testing in Arizona
No public lab, use a private one · Olsen phosphorus
AR
University of Arkansas Division of Agriculture Soil Testing and Research Laboratory
University of Arkansas Division of Agriculture · Marianna · Mehlich-3 phosphorus
CA
Soil Testing in California
No public lab, use a private one
CO
Colorado State University Soil, Water and Plant Testing Laboratory
Colorado State University · Denver · AB-DTPA phosphorus
CT
University of Connecticut Soil Nutrient Analysis Laboratory
University of Connecticut · Storrs · Modified Morgan phosphorus
DE
University of Delaware Soil Testing Program
University of Delaware · Newark · Mehlich-3 phosphorus
FL
University of Florida IFAS Extension Soil Testing Laboratory
University of Florida IFAS · Gainesville · Mehlich-3 phosphorus
GA
University of Georgia Soil, Plant & Water Laboratory
University of Georgia · Athens
HI
University of Hawaiʻi at Mānoa Agricultural Diagnostic Service Center
University of Hawaiʻi at Mānoa · Honolulu · Mehlich-3 or Olsen phosphorus
ID
University of Idaho Analytical Sciences Laboratory
University of Idaho · Moscow · Olsen or Bray P1 phosphorus
IL
Soil Testing in Illinois
No public lab, use a private one
IN
Soil Testing in Indiana
No public lab, use a private one
IA
Soil Testing in Iowa
No public lab, use a private one
KS
Kansas State University Soil Testing Laboratory
Kansas State University · Manhattan · Mehlich-3 phosphorus
KY
University of Kentucky Division of Regulatory Services Soil Lab
University of Kentucky · Lexington · Mehlich-3 phosphorus
LA
LSU AgCenter Soil Testing and Plant Analysis Lab
LSU AgCenter · Baton Rouge · Mehlich-3 phosphorus
ME
University of Maine Maine Soil Testing Service
University of Maine · Orono · Modified Morgan phosphorus
MD
Soil Testing in Maryland
No public lab, use a private one
MA
University of Massachusetts Amherst Soil and Plant Nutrient Testing Laboratory
University of Massachusetts Amherst · Amherst · Modified Morgan phosphorus
MI
Michigan State University Extension Home Lawn and Garden Soil Test
Michigan State University Extension
MN
University of Minnesota Soil Testing Laboratory
University of Minnesota · St. Paul · Olsen or Bray P1 phosphorus
MS
Mississippi State University Extension Soil Testing
Mississippi State University
MO
University of Missouri Soil and Plant Testing Laboratory
University of Missouri · Columbia · Bray P1 phosphorus
MT
Soil Testing in Montana
No public lab, use a private one · Olsen phosphorus
NE
Soil Testing in Nebraska
No public lab, use a private one
NV
Soil Testing in Nevada
No public lab, use a private one
NH
University of New Hampshire Extension Soil Testing Service
University of New Hampshire Extension · Durham
NJ
Rutgers University Soil Testing Laboratory
Rutgers University · New Brunswick · Mehlich-3 phosphorus
NM
Soil Testing in New Mexico
No public lab, use a private one
NY
Soil Testing in New York
No public lab, use a private one
NC
NC Department of Agriculture Agronomic Services Division
NC Department of Agriculture · Raleigh · Mehlich-3 phosphorus
ND
North Dakota State University Soil Testing Laboratory
North Dakota State University · Fargo · Olsen phosphorus
OH
Soil Testing in Ohio
No public lab, use a private one
OK
Oklahoma State University Soil, Water and Forage Analytical Laboratory
Oklahoma State University · Stillwater · Mehlich-3 phosphorus
OR
Soil Testing in Oregon
No public lab, use a private one · Olsen or Bray P1 phosphorus
PA
Penn State University Agricultural Analytical Services Lab
Penn State University · University Park · Mehlich-3 phosphorus
RI
Soil Testing in Rhode Island
No public lab, use a private one · Modified Morgan phosphorus
SC
Clemson University Agricultural Service Laboratory
Clemson University · Clemson · Mehlich-1 phosphorus
SD
Soil Testing in South Dakota
No public lab, use a private one
TN
University of Tennessee Soil, Plant and Pest Center
University of Tennessee · Nashville · Mehlich-1 phosphorus
TX
Texas A&M AgriLife Extension Soil, Water and Forage Testing Laboratory
Texas A&M AgriLife Extension · College Station · Mehlich-3 phosphorus
UT
Utah State University Analytical Laboratories
Utah State University · Logan · Olsen phosphorus
VT
University of Vermont Agricultural and Environmental Testing Lab
University of Vermont · Burlington · Modified Morgan phosphorus
VA
Virginia Tech Soil Testing Lab
Virginia Tech · Blacksburg
WA
Soil Testing in Washington
No public lab, use a private one · Olsen phosphorus
WV
West Virginia University Soil Testing Laboratory
West Virginia University · Morgantown · Mehlich-3 phosphorus
WI
University of Wisconsin–Madison Soil and Forage Lab
University of Wisconsin–Madison · Madison · Bray P1 phosphorus
WY
Soil Testing in Wyoming
No public lab, use a private one

Other States

These states aren’t listed yet. Your local Extension office can tell you where to send a sample.

Bizon is an independent business and isn’t affiliated with or endorsed by any university or Extension service. Details were checked against each lab’s or Extension service’s own pages in October 2026. Why Bizon supports Extension.

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