C.R.S. § 25-10-105

(1) Rules adopted by local boards of health under section 25-10-104 (2) or (4) or promulgated by the commission under section 25-10-104 (1) govern all aspects of the location, design, construction, performance, alteration, installation, and use of on-site wastewater treatment systems and must include minimum standards established by the commission. (2) Intentionally left blank —Ed. (a) A local board of health may grant variances to OWTS rules in accordance with the criteria adopted by the commission under this article. (b) Applicants for a variance from OWTS rules have the burden of supplying the local board of health with information demonstrating that conditions exist that warrant the granting of the variance.