21 CFR §112.47

1. (a)You may meet the requirements related to agricultural water testing required under §§ 112.43(c)(4)(ii) and 112.44 using:
   1. (1)Results from agricultural water testing performed by you or by a person or entity acting on your behalf; or
   2. (2)Data collected by a third party or parties, provided the water sampled by the third party or parties adequately represents your agricultural water source(s) and all other applicable requirements of this part are met.
2. (b)Agricultural water samples must be aseptically collected and tested using methods as set forth in § 112.151, as applicable.