St. Charles County, MO
 
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Table of Contents
Table of Contents
[Ord. No. 99-99 §1, 7-12-1999; Ord. No. 01-054 §1, 4-25-2001; Ord. No. 02-122 §1, 7-30-2002; Ord. No. 02-176 §1, 11-27-2002; Ord. No. 06-002 §1, 1-10-2006; Ord. No. 06-157 §1, 11-14-2006; Ord. No. 07-001 §1, 1-3-2007; Ord. No. 07-147 §1, 10-30-2007; Ord. No. 09-070 §3, 6-29-2009; Ord. No. 10-041 §47, 6-2-2010]
A. 
Purpose. The purpose of the wastewater disposal regulations shall be to provide minimum standards for the design, construction and operation and maintenance of wastewater treatment facilities to protect surface water and ground water from contamination by human sewage and waterborne household, commercial and industrial wastes; to protect public health and safety and to eliminate or prevent the development of public nuisances.
B. 
Treatment System Requirements. All residential structures, commercial and industrial buildings, public and semi-public facilities, and other uses of land having occupants in the unincorporated areas of St. Charles County shall hereafter be equipped with an adequate, safe and sanitary disposal system for all human, domestic, and industrial wastes. For purposes of this Chapter or Chapter 410, treatment of wastewater shall be by one (1) of the following methods:
1. 
An existing wastewater treatment facility approved by the Missouri Department of Natural Resources and owned and operated by an appropriate local wastewater regulatory authority as referenced below in Section 405.500(B)(2)(a—b).
2. 
A newly constructed wastewater treatment facility regulated by the Missouri Department of Natural Resources and approved and operated as provided herein.
a. 
All newly constructed wastewater treatment facilities must meet the following requirements:
(1) 
Such facilities must meet not only the applicable effluent limitations imposed by the Missouri Department of Natural Resources, but also the following effluent limitations:
(a) 
Ten (10) milligrams or less per liter for biochemical oxygen demand ("BOD"); and
(b) 
Ten (10) milligrams or less per liter for total suspended solids (non-filterable residue); and
(c) 
Removal of ammonia nitrogen to two and one-half (2.5) milligrams per liter or less for September through March and to less than one (1) milligram per liter for April through August; and
(d) 
Removal of eighty percent (80%) of total phosphorus or removal of phosphorus to two (2) milligrams per liter, whichever is less; and
(e) 
Disinfection to achieve effluent fecal coliform counts of less than two hundred (200) counts or colonies per one hundred (100) milliliters.
(2) 
Such newly constructed wastewater treatment facilities must be Membrane Bioreactor (MBR) Technology Treatment Systems or equivalent, cost-effective technology approved by the Director of Community Development. In each instance where a facility other than a MBR Technology Treatment System is proposed, that facility must be proven by actual (not bench scale) plant data to meet performance standards, reliability, and fail-safe design as determined and certified by a licensed professional engineer acceptable to the County. The licensed professional engineer acceptable to the County must also certify that in the event of system failure or malfunction, the facility will still perform such that untreated effluent will not be released into the adjacent watershed. Upon receipt of these certifications, the Director of Community Development shall make a determination as to whether or not the proposed facility is equivalent technology that will be acceptable to the County. Such systems must be owned, operated and maintained by one (1) of the following continuing authorities:
(a) 
A municipality or public sewer district which has been designated as the area-wide management authority under Section 208(c)(1) of the Federal Clean Water Act; or
(b) 
A municipality, public sewer district or sewer company regulated by the Public Service Commission (PSC) which currently provides sewage collection and/or treatment services on a regional or watershed basis as outlined in 10 CSR 20-6.010(3)(C) and approved by the Clean Water Commission; or
(c) 
A municipality, public sewer district or sewer company regulated by the PSC other than one which qualifies under Sections 405.500(B)(2)(a)(2)(a) and (b) above or a public water supply district.
b. 
Design accommodations for such newly constructed wastewater treatment facilities shall include, but not be limited to, the following:
(1) 
The wastewater treatment facility shall be located in common ground, within an easement granted or reserved for the purpose of constructing and operating such a facility, or on land owned by a continuing authority.
(2) 
The wastewater treatment facility shall be located at least one hundred fifty (150) feet from any dwelling.
3. 
A no-discharge facility approved by the Missouri Department of Natural Resources and St. Charles County Division of Building and Code Enforcement.
[Ord. No. 16-054 §11, 7-25-2016]
4. 
Private sewage disposal systems regulated by the St. Charles County Division of Building and Code Enforcement requiring a permit and all necessary inspections where there is no possibility for connection to a sanitary sewer according to the local wastewater regulatory authority. Such systems may be permitted as follows:
[Ord. No. 16-054 §11, 7-25-2016]
a. 
New private sewage disposal systems. Parcels upon which a new private sewage disposal system is to be installed shall contain a total of not less than three (3) acres per dwelling unit unless Division of Building and Code Enforcement approval is given for existing parcels less than three (3) acres on a case-by-case basis. The minimum area needed for a private sewage disposal system could be reduced to one (1) acre, with Division of Building and Code Enforcement approval, provided that all other requirements of this Chapter and Chapter 410 are met.
b. 
Repair or replacement of existing private sewage disposal systems. Existing private sewage disposal systems that serve existing residential structures may be repaired or replaced, provided those systems and structures are on parcels that contain a total of not less than three (3) acres per dwelling unless Division of Building and Code Enforcement approval is given for existing parcels less than three (3) acres on a case-by-case basis, and provided further:
(1) 
That the Division of Building and Code Enforcement determines that a functional private sewage disposal system can be installed on the parcel in question, and
(2) 
That all other requirements of this Chapter and Chapter 410 are met.
(3) 
That any appeal from an adverse determination by the Division of Building and Code Enforcement shall be to the Building Commission of St. Charles County, as provided by the Private Sewage Disposal Code of St. Charles County, Section 500.300, OSCCMo, notwithstanding any provision to the contrary of this Unified Development Ordinance of St. Charles County, Missouri.
If possible, public water supply should be available to these lots. The owner of the property will be required to connect to sanitary sewers, if available, within the distance set by the applicable Building Code and the local wastewater regulatory authority.
C. 
All newly constructed residentially zoned subdivisions, and all new subdivisions of land or any division of land into parcels or tracts, having lots, tracts or sites of an area less than three (3) acres in size, must be served by a wastewater treatment facility meeting the requirements imposed by Section 405.500(B)(1) or (2) above, as applicable.
D. 
All campground and travel trailer parks shall have one (1) of the following methods of sewage disposal:
1. 
Sanitary sewers connected to a regional wastewater treatment facility.
2. 
A wastewater treatment facility meeting the requirements imposed by Section 405.500(B)(2) above and approved by the Missouri Department of Natural Resources and by the St. Charles County Division of Building Code Enforcement.
[Ord. No. 16-054 §11, 7-25-2016]
3. 
RVs equipped with self-contained waste storage compartments.
E. 
For floodplain areas, see Floodway, Floodway Fringe and Density Floodway Overlay Districts.
F. 
Permits.
[Ord. No. 16-054 §11, 7-25-2016]
1. 
Building permit. A building permit for a wastewater treatment facility shall not be issued by the Division of Building and Code Enforcement until a copy of an approved engineering report and an approved construction permit issued by the Missouri Department of Natural Resources is received for the construction of the facility and the Division of Building and Code Enforcement has determined that the requirements of Section 405.500(B)(2) are met or shall be met by the time the plant is operational and eligible for an operating permit from MDNR and for a certificate of occupancy from the Division of Building and Code Enforcement. Whenever the Division must determine whether those requirements shall be met in the future, the Division may do so upon an applicant's submission of evidence including documentation that a continuing authority meeting the requirements of Section 405.500(B)(2) or an entity seeking certification by the PSC as such an authority has agreed to own, operate and maintain the permitted wastewater treatment system. Under such circumstances, any land use and building permit issued for such a wastewater treatment plant shall provide that no certificate of occupancy may be issued for it until it is owned, operated and maintained by such a continuing authority.
2. 
Notice. The following notice shall appear on all plats served by new wastewater treatment systems and be supplied by developer or seller to all buyers of lots within those plats: "Property within this plat is to be served by a new wastewater treatment plant that will not operate until the St. Charles County Division of Building and Code Enforcement issues a certificate of occupancy after confirming that it is owned, operated and maintained by an operating authority specified in Section 405.500 of the United Development Ordinance of St. Charles County, Missouri."
[1]
Editor's Note—Reference to planning department was changed to division of planning in accordance with Ord. No. 02-204, adopted 12-23-2002, set out in ch. 132 of this code. For designation of the division of planning and zoning, see Ord. No. 03-195 adopted 12-31-2003.