The Performance Assessment Program (PAP) is a voluntary program offered as a service of the Soil Science Society of America (SSSA), Madison, WI, as a part of the North American Proficiency Testing program (NAPT). The PAP program is valued by the USDA-NRCS as assurance that soil test analyses are being performed using validated testing methods. The PAP program may be required by soil and plant analysis laboratories that complete analyses for federal government programs involved with the development of nutrient management plans and cost sharing programs.

To participate in the PAP program, you must be enrolled in a four-quarter NAPT program and adhere to the PAP Ethics Declaration. When enrolling in the PAP program, please read, sign and return the Ethics Declaration (PDF).

Do I need to do PAP?  It depends. Does your laboratory have specific testing requirements that need to be satisfied, such as through the USDA-NRCS or a State-level Department of Ag? The PAP is designed to help laboratories achieve these types of approvals on specific tests or analytes. If your laboratory is not qualifying for such a program, then NAPT participation may be sufficient for showing your facility is checking QA/QC as part of routine. Still have questions? Ask us!

Program Update!

Starting in 2024, there has been a slight change in the PAP offerings. Essentially, all metrics having a sufficient number of test reports may now be included in the PAP. Nothing changes for current participants in the Soil and/or Plant PAP – there are now more options going forward. For example, it is now possible for NAPT participants to enroll in Soil PAP and submit only soil carbon analysis by dry combustion. Please reach out the NAPT Director if you have any questions.

These facilities passed the 2023 PAP and are thus approved for 2024:

AgSource - Bonduel (Soil)
106 N Cecil St PO Box 788 Bonduel WI 54107
715-758-2178 |http://www.agsource.com

AgSource - Harris (Soil & Plant)
300 Speedway Circle Ste 2 Lincoln NE 68502
402-476-0300 |http://www.agsource.com

AGVISE Laboratories - Benson (Soil & Plant) 
902 13th St N PO Box 187 Benson MN 56215
320-849-4109 |http://www.agvise.com

AGVISE Laboratories - Northwood (Soil & Plant) 
604 Hwy 15 PO Box 510 Northwood ND 58267
701-587-6010 |http://www.agvise.com

American Agricultural Lab - Olsen's Agricultural Lab (Soil & Plant)
700 W D St McCook NE 69001
308-345-3670 |http://www.amaglab.com

Brookside Laboratories (Soil & Plant) 
200 White Mountain Dr New Bremen OH 45869
419-977-2766 |http://www.blinc.com

Calmar Soil Testing Laboratory (Soil)
130 S State St Westerville OH 43081
614-523-1005 |http://www.calmarlabs.com

Dairy One Soil Testing Laboratory (Soil)
730 Warren Rd Ithaca NY 14850
607-257-1272 x2039 |http://www.dairyone.com

Dellavalle Laboratory (Soil & Plant)
1910 W McKinley Ste 110 Fresno CA 93728
559-233-6129 |http://www.dellavallelab.com

EarthOptics, Inc. 
1250 45th St Ste 340 Emeryville CA 94608
623-734-8360 |https://earthoptics.com    

FERTILAB (Fertilidad de Suelos S. de R.L.) (Soil & Plant)
Poniente 6 #200 Ciudad Industrial Celaya Guanajuato 38010 Mexico
52-956-581-0943 |http://www.fertilab.com.mx

Grupo Integral de Servicios Fitosanitarios ENA S.A de C.V (Soil & Plant)
Emiliano Zapata #10 Col. San Luis Huexotla Texcoco de Mora MX 56250 Mexico
52-595-928-4077 |https://gisenalabs.com.mx

Laboratorio de Calidad Alcodesa (Soil)
Alimentos Concentrados de Delicias S.A. de C.V.
Calle Julimes s/n Parque Industrial Delicias
Delicias 33116 Mexico

Laboratorios Labfrusco S.A. de C.V (Soil)
Blvd. Emiliano Zapata 4699-15 Col. Villa Serena CP
Culiacan, Sinaloa, 80159 Mexico
52-667-170-4040 |http://www.labrusco.com

Matrix Sciences International, dba Kuo Testing Labs (Soil & Plant)
119 E Main St Omaha NE 99344
800-328-0112 |http://www.kuotestinglabs.com

Midwest Laboratories (Soil) 
13611 B St Omaha NE 68144
402-334-7770 x374 |http://www.midwestlabs.com

MN Valley Testing Laboratories - New Ulm (Soil & Plant) 
1126 N Front St New Ulm MN 56073
507-766-4705 |http://www.mvtl.com

Northwest Agricultural Consultants (Soil & Plant)
2545 W Falls Ave Kennewick WA 99336
509-783-7450 |http://www.nwag.com

OSU Soil Health Lab (Soil) 
Oregon State University
3017 Ag Life Sciences Bldg Corvallis OR 97331
541-737-2187 |http://cropandsoil.oregonstate.edu/cal

Regen Ag Lab (Soil & Plant) 
31740 Hwy 10 Pleasanton NE 68866
308-440-7560 |http://ww.regenaglab.com

Servi-Tech Laboratories - Amarillo (Soil & Plant)
6921 S Bell St Amarillo TX 79109
806-677-0093 |http://www.servitechlabs.com

Servi-Tech Laboratories - Dodge City (Soil & Plant)
1816 East Wyatt Earp Blvd Dodge City KS 67801
620-227-7123 |http://www.servitechlabs.com

Servi-Tech Laboratories - Hastings (Soil)
1602 Park West Dr Hastings NE 68902
402-463-3522 |http://www.servitechlabs.com

Simply Soil Testing (Soil)
20312 Lafayette Rd Burlington WA 98233
360-202-1086 |http://www.simplysoiltesting.com

Sociedad Cooperativa Agropecuaria de la Comarca (Soil)
Calle Cuatrocienegas Sin Numero Parque Industrial Carlos Herrera Araluce
Gomez Palacio DG 35079 Mexico

SoilTest Farm Consultants (Soil & Plant) 
2925 Driggs Dr Moses Lake WA 98837
509-765-1622 |http://www.soiltestlab.com

Stukenholtz Laboratory (Soil & Plant)
2924 Addison Ave E PO Box 353 Twin Falls ID 83301
208-734-3050 |http://stukenholtz.com

United Soils (Soil & Plant)
108 S Crystal Lane Fairbury IL 61739
815-692-2626 |http://ww.unitedsoilsinc.com

USU Analytical Lab (Soil) 
Utah State University 1541 N 800 E 9400 Old Main Hill Logan UT 84322
435-797-2217 |http://www.usual.usu.edu

Ward Laboratories (Soil & Plant) 
4007 Cherry Ave PO Box 788 Kearney NE 68847
308-234-2418 |http://www.wardlab.com

Waters Agricultural Laboratory - Camilla (Soil & Plant) 
257 Newton Hwy PO Box 382 Camilla GA 31730
229-336-7216 |http://www.watersag.com

Waters Agricultural Laboratory - Vicksburg (Soil)
4589 Highway 61 S Vicksburg MS 39180
601-429-6456 |https://watersag.com

Waypoint Analytical, Illinois (Soil)
2902 Farber Rd Champaign IL 61822
217-359-7680 |http://www.waypointanalytical.com

Waypoint Analytical, Iowa (Soil)
700 Park Dr Atlantic IA 50022
901-213-2400 |http://www.waypointanalytical.com

Waypoint Analytical, Tennessee (Soil)
2790 Whitten Rd Memphis TN 38133
901-213-2400 |http://www.waypointanalytical.com

West Virginia Department of Agriculture (Soil)
60B Industrial Park Road Moorefield WV 26836
304-538-2397 |https://agriculture.wv.gov

Western Laboratories (Soil)
211 Hwy 95 PO Box 1020 Parma ID 83660
208-722-6564 |http://www.westernlaboratories.com

Woods End Laboratories (Soil)
150 Whitten Rd Augusta ME 04330
207-293-2457 |https://woodsend.com