Colorado Code § 25-10-104

Regulation of on-site wastewater treatment systems - state and local rules
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(1) The division shall develop, and recommend to the commission for adoption, rules
setting forth minimum standards for the location, design, construction, performance, installation,
alteration, and use of on-site wastewater treatment systems within Colorado. The commission
may establish criteria for issuing variances in the rules.
(2) Every local board of health in the state shall develop and adopt detailed rules for on-
site wastewater treatment systems within its area of jurisdiction. The rules must comply with the
rules adopted by the commission pursuant to subsection (1) of this section and with sections 25-
10-105 and 25-10-106. Before finally adopting such rules or any amendment to the rules, the
local board of health shall hold a public hearing on the proposed rules or amendments. The local
board of health shall give notice of the time and place of the hearing at least once, at least twenty
days before the hearing, in a newspaper of general circulation within its area of jurisdiction.
After the public hearing and before final adoption, the local board of health may make changes
or revisions to the proposed rules or amendments, and no further public hearing is required
regarding the changes or revisions. All rules and amendments must be transmitted to the
department no later than five days after final adoption and become effective forty-five days after
final adoption unless the department notifies the local board of health before the forty-fifth day
that the rules or amendments are not in compliance with this section or section 25-10-105 or 25-
10-106.
(3) If a local board of health has not adopted rules in compliance with this section and
submitted them to the commission, the commission shall promulgate rules for the areas of the
state for which no complying rules have been adopted, except for areas serviced exclusively by a
sewage treatment works. Rules for such areas of the state promulgated by the commission must
comply with the rules adopted under subsection (1) of this section and sections 25-10-105 and
25-10-106. The rules must be the same for all the areas of the state for which the commission
promulgates such rules, except as may be appropriate to provide for differing geologic
conditions.
(4) A local board of health may adopt rules after action by the commission under
subsection (3) of this section, if the rules comply with the procedural requirements of subsection
(2) of this section and are no less stringent than those promulgated by the commission. Rules of
the local board so adopted become effective only after they are transmitted to the division and
the division determines that they comply with this section and sections 25-10-105 and 25-10-
106.
(5) In promulgating rules under this article, the commission and local boards of health
shall give consideration to the protection of public health and water quality.

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