Mail Hay Tests To:

Sierra Testing Services

9450 E. Collier Rd

Acampo, CA 95220

Are you a new client?

What to Include with Test(s):

*See Sample ID Tags*

- Your billing information

- Phone number

- Preferred method of        obtaining results (fax,      email, etc.)

- Sample ID

- Product type

- Test to be run

>Equine program      tests must be  specifically labeled!

>Grasses ONLY!


 Samples are picked up Monday through Friday. Please note the time change for pick up for each box. Samples are received the next morning around

10:00 AM, except Friday's pick up is delivered the following Monday.

Drop Off Before 6:00 PM


Joe Heidrick's

36826 County Rd 24

Woodland, CA

Drop Off Before 6:00 PM

VanGroningen’s Scale

Corner of Jack Tone & French Camp Rd in Escalon, CA

** Maps for STS and Drop Boxes are located on the “Helpful Links & Maps” Page


STS  is contracted with Dairyland Laboratories in Arcadia, Wisconsin for wet chemistry analysis. Several packages are available. Dairyland results may take 7-10 days to be received. Due to an increase in processing fees, Nitrate testing is a flat rate of $15. For pricing on all other tests please contact us for your needs.

If you are submitting a sample for retesting, the sample must be labeled as follows in order to avoid being submitted and charged as a new test.
- Must indicate that it is a retest
- Original Sample Number (indicated on provided analysis)
- Original Sample ID

$4.00 per sample fee for using the drop box service

SIERRA TESTING SERVICE:  9450 E. Collier Rd.  *  Acampo, CA 95220  *  209-333-3337 *

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Hours Of Operation

Monday - Saturday   8:00 AM - 5:00 PM

*Please call prior to Saturday testing*

Sunday                      Closed