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McDonald County adds two prohibitions to wastewater ordinance limiting small-lot systems and multiple connections
Summary
On Feb. 4, 2026, McDonald County commissioners revised the Waste Water Treatment System Ordinance to bar onsite systems on lots smaller than 0.92 acre under certain platting conditions and to forbid more than one residence connecting to a single onsite system; duplexes are counted as one residence.
McDonald County commissioners reviewed and revised the Waste Water Treatment System Ordinance on Feb. 4, adding two new prohibitions to the county code.
The new provision 4.10 prohibits installation of an onsite wastewater system on a lot smaller than 0.92 acre when the lot was platted and recorded by the Department of Natural Resources after May 6, 1999. Provision 4.11 bars attaching more than one residence, house or commercial facility to an onsite wastewater system; the minutes specify that multiple-family dwellings such as duplexes will be considered a single residence for the ordinance’s purposes.
The minutes state the revisions are effective as of the review date. The full, updated ordinance is available at the county’s website, mcdonaldcountymo.gov. The minutes do not record a vote tally or identify an ordinance number for the change; they record that the commissioners revised the ordinance and listed the new prohibitions in the meeting record.
County officials did not specify implementation timelines, enforcement mechanisms, or whether the changes require separate administrative rulemaking or public-notice steps beyond this review. Residents or property owners seeking details were directed to review the ordinance text on the county website or contact county offices for clarification.
