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