CERTIFIED LABS
The following member labs have met the certification qualifications of ALTA as of August 2025.
The Agricultural Laboratory Testing Association (ALTA) strives to ensure that member labs always provide their clients with accurate, reliable and consistent data. This is accomplished through lab participation in the ALTA-Lab Accreditation Program (LAP), which utilizes soil analyses data developed through the Agricultural Laboratory Proficiency (ALP) Program or North American Proficiency Testing (NAPT) Program, international testing programs. Members submit data to the ALTA-LAP program and it is evaluated every four months.
Labs must meet certain qualification standards each cycle to remain certified. The rules of certification may be found by clicking on the “Soil Certification” section on this site’s header bar.
CERTIFIED LABS - JULY 2025
Fort Wayne, IN
Fort Wayne, IN
Fort Wayne, IN
pH Water 1:1
pH Salt 1:2
Sikora Buffer pH
SMP Buffer pH
P-Mehlich 3 ICP
K-Mehlich 3 ICP
K-Ammonium Acetate
SOM-LOI
Harrington, DE
Fort Wayne, IN
Fort Wayne, IN
pH Water 1:1
P-Mehlich 3 ICP
K-Mehlich 3 ICP
SOM-LOI
Bonduel, WI
Fort Wayne, IN
Ellsworth, IA
pH Water 1:1
Sikora Buffer pH
P-Mehlich 3 ICP
Bray-P1
K-Mehlich 3 ICP
K-Ammonium Acetate
SOM-LOI
Zinc DTPA
Ellsworth, IA
Fort Wayne, IN
Ellsworth, IA
pH Water 1:1
Sikora Buffer pH
P-Mehlich 3 Spec
P-Mehlich 3 ICP
Bray-P1
K-Mehlich 3 ICP
K-Ammonium Acetate
SOM-LOI
Lincoln, NE
New Bremen, OH
Stratford, WI
pH Water 1:1
Sikora Buffer pH
P-Mehlich 3 ICP
Bray-P1
K-Ammonium Acetate
Zinc DTPA
Stratford, WI
New Bremen, OH
Stratford, WI
pH Water 1:1
Sikora Buffer pH
Bray-P1
P-Mehlich 3 ICP
K-Ammonium Acetate
SOM-LOI
Lakewood, IL
New Bremen, OH
New Bremen, OH
pH Water 1:1
P-Mehlich 3 ICP
K-Mehlich 3 ICP
New Bremen, OH
New Bremen, OH
New Bremen, OH
pH Water 1:1
Sikor Buffer pH
P-Mehlich 3 ICP
K-Mehlich 3 ICP
SOI-LOI
Charter Soil Testing - Dwight, IL
Charter Soil Testing - Dwight, IL
Charter Soil Testing - Dwight, IL
pH Water 1:1
P-Mehlich 3 Spec
Bray-P1
K-Mehlich 3 ICP
Centralia, IL
Charter Soil Testing - Dwight, IL
Charter Soil Testing - Dwight, IL
pH Water 1:1
P-Mehlich 3 ICP
K-Mehlich 3 ICP
SOM-LOI
Milford Center, OH
Charter Soil Testing - Dwight, IL
KSI Labs - Shelbyville, IL
pH Water 1:1
P-Mehlich 3 ICP
K-Mehlich 3 ICP
SOM-LOI
KSI Labs - Shelbyville, IL
Charter Soil Testing - Dwight, IL
KSI Labs - Shelbyville, IL
pH Water 1:1
Sikora Buffer pH
P-Mehlich 3 ICP
K-Mehlich 3 ICP
SOM-LOI
Omaha, NE
Washington Court, OH
Windsor, IL
pH Water 1:1
Bray-P1
P-Mehlich 3 Color
K-Ammonium Acetate
Windsor, IL
Washington Court, OH
Windsor, IL
pH Water 1:1
P-Mehlich 3 Spec
K-Mehlich 3 ICP
Waterrown, WI
Washington Court, OH
Washington Court, OH
pH Water 1:1
Sikora Buffer pH
Bray-P1
P-Mehlich 3 ICP
K-Mehlich 3 ICP
SOM-LOI
Washington Court, OH
Washington Court, OH
Washington Court, OH
pH Water 1:1
pH Salt 1:2
Sikora Buffer pH
P-Mehlich 3 ICP
Bray-P1
K-Melich 3 ICP
K-Ammonium Acetate SOM-LOI
Indianapolis, IN
Indianapolis, IN
Indianapolis, IN
pH Water 1:1
pH Salt 1:2
Sikora Buffer pH
P-Mehlich 3 ICP
K-Melich 3 ICP
SOM-LOI
Fairbury, IL
Indianapolis, IN
Indianapolis, IN
pH Water 1:1
Sikor Buffer pH
P-Mehlich 3 ICP
K-Mehlich 3 ICP
SOM-LOI
Zinc DTPA
Kearney, NE
Indianapolis, IN
Owensboro, KY
pH Water 1:1
pH Salt 1:2
Bray-P1
P-Mehlich 3 ICP
K-Ammonium Acetate
SOM-LOI
DTPA Zinc
Owensboro, KY
Indianapolis, IN
Owensboro, KY
pH Water 1:1
Sikora Buffer pH
P-Mehlich 3 ICP
K-Mehlich 3 ICP
SOM-LOI
Memphis, TN - Champaign, IL Atlantic, IA
Memphis, TN - Champaign, IL Atlantic, IA
Memphis, TN - Champaign, IL Atlantic, IA
pH Water 1:1
P-Mehlich 3 ICP
K-Mehlich 3 ICP
Shafter, CA
Memphis, TN - Champaign, IL Atlantic, IA
Memphis, TN - Champaign, IL Atlantic, IA
pH Saturated Paste
PO4 Olsen
K-Ammonium Acetate
DTPA Zinc
