C.R.S. § 25-8-304: Monitoring, recording, and reporting.

(1) The owner or operator of any facility, process, or activity from which a discharge of pollutants is made into state waters or into any municipal domestic wastewater treatment works shall, according to standard procedures and methods prescribed by the division:

(a) Establish and maintain records;

(b) Make reports;

(c) Install, calibrate, use, and maintain monitoring methods and equipment, including biological and indicator pollutant monitoring methods;

(d) Sample discharges;

(e) Provide additional reasonably available information relating to discharges into domestic wastewater treatment works.