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Johns Creek's MS4 Operation and Maintenance

The Land Development Division created this MS4 webpage to inform and help familiarize residents, developers, engineers, contractors, etc. with the City of Johns Creek's Stormwater and Erosion and Sediment Control Programs. 

View more information:
The City’s Stormwater Management Program documents [document and link to be provided]

The City’s MS4

The MS4 is the portion of the Separate Storm Sewer System (MS4) in the City that is under direct City control and ownership.  
The MS4 includes storm water infrastructure assets that are City parks, City facilities, City right-of-way, etc):
  • Inlets (curb inlets, catch basins, ditch bottom inlets, table top inlets, etc),
  • Junctions (boxes and manholes),
  • Ditches (including defined and engineered swales),
  • Pipes, (including box culverts, cross-drains, driveway culverts, etc.), and  
  • Storm Water Management System (SWMS) Ponds (wet/dry, above ground and underground) 
The City is responsible for maintenance of the City’s MS4
The City is does not provide operation and maintenance (cleaning, repair, replacement) service on portions of the storm sewer system outside of the City’s MS4, except in rare, case-by-case, emergency situations.  Examples of rare emergency situations include: work to clear or repair the drainage system to maintain open lanes on City streets and roads, protect an imminent danger to public health, and/or existing flooding of primary (habitable) structures.
The MS4 does not include those listed infrastructure assets that are not under the direct control of the City.  At this time, there are no easements that exist on private property (Subdivisions) that are included in the definition of the City’s MS4 system.  
The City will respond to drainage complaints.
Maintenance of any storm water infrastructure on privately owned property, whether inside an easement or not is the responsibility of individual property owners or their Home Owners / Property Owners Association) (HOA/POA). To determine if an HOA or POA is responsible, property owners should consult their HOA/POA covenants.  Furthermore, the City’s MS4 does not include storm water infrastructure assets owned, operated, and/or maintained by another MS4, i.e. GDOT.

City’s MS4 Outfalls Defined

The State of Georgia General NPDES Stormwater Permit No. GAG610000 defines an outfall as “the most downstream point (i.e. final discharge point) on an MS4 where it discharges to receiving waters of the State.”  For clarification, the City of Johns Creek makes the following distinctions:
  1. There are Private Outfalls, City MS4 Outfalls, and GDOT MS4 Outfalls
  2. If a pipe or ditch discharges storm runoff collected from areas outside of the boundaries of State waters, to State waters, it is an Outfall.
  3. If the Outfall discharges storm runoff collected directly from City-owned property, e.g. right-of-way or City-owned property or facilities, it is a City MS4 Outfall.
  4. If the Outfall discharges storm runoff collected directly from GDOT right-of-way or GDOT-owned property, it is a GDOT MS4 Outfall.
  5. If the Outfall discharges storm runoff collected directly from private roads, easements, and/or property, it is a Private Outfall.
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State of Georgia MS4 Related Definitions*

Stormwater – stormwater runoff, snow melt runoff, and surface runoff and drainage.
Stormwater Management Program or SWMP or Program – the Stormwater Management Program required to be developed and implemented under the terms and conditions of this, the State NPDES General Permit for Small MS4s, permit and refers to a comprehensive program to manage the quality of stormwater discharged from an MS4.
Municipal Separate Storm Sewer System (MS4) – A conveyance or system of conveyances including roads with drainage systems, municipal streets, catch basins, curbs, gutters, ditches, manmade channels or storm drains, owned or operated by a municipality or other public body, designed or used for collecting or conveying stormwater runoff and is not a combined sewer or part of a Publicly Owned Treatment Works.
Small MS4 (defined in 40 CFR Part 122.26(b)(16)) – all separate storm sewers that are owned or operated by the United States, the State of Georgia, city, town, borough, county, parish, district, association, or other public body (either created by or pursuant to State law) having jurisdiction over disposal of sewage, industrial wastes, stormwater, or other wastes, including special districts under State law such as a sewer district, flood control district or drainage district, or similar entity or a designated and approved management agency under Section 208 of the Clean Water Act (CWA) that discharges to the waters of the State of Georgia but is not defined as a “large” or “medium” MS4.  This term includes systems similar to municipal MS4s, such as systems at military bases, large hospitals, universities, prison complexes, and highways and other thoroughfares.  This definition does not include separate storm sewers in very discrete areas, such as individual buildings.
Best Management Practice – both structural devices to store or treat stormwater runoff and non-structural programs or practices which are designed to prevent or reduce the pollution of the waters of the State of Georgia.
Construction General Permits or CGPs – the Georgia NPDES Permit for Stormwater Discharges Associated with Construction Activity Nos. GAR1000001, GAR100002, and GAR100003, which identify the Manual for Erosion and Sediment Control in Georgia (Green Book) and stream buffer requirements.
Discharge – the discharge of a pollutant.
Discharge-related Activities – includes activities which cause, contribute to, or result in stormwater point source pollutant discharge; and measures to control stormwater discharges, including siting, construction and operation of BMPs to control, reduce, or prevent stormwater pollution.
Illicit Connection – any man-made conveyance connecting a non-stormwater discharge directly to a municipal separate storm sewer system.
Illicit Discharge – any direct or indirect non-stormwater discharged to a municipal separate storm sewer system, including, but not limited to sewage, process wastewater, and washwater.  The discharge may be continuous or intermittent in occurrence.
Maximum Extent Practicable – the controls necessary for the reduction of pollutants discharged from a municipal separate storm sewer system.  These controls may consist of a combination of BMPs, control techniques, system design and engineering methods, and such other provision for the reduction of pollutants discharged from an MS4 as described in the SWMP.
National Pollutant Discharge Elimination System or NPDES – the program for issuing, modifying, revoking and reissuing, terminating, monitoring and enforcing permit and imposing and enforcing pretreatment requirements under Sections 307, 402, 318, and 405 of the Clean Water Act (CWA).
Notice of Intent – the mechanism used to register for coverage under the State NPDES General Permit for Small MS4s or the State CGPs.
Outfall – the most downstream point (i.e. final discharge point) on an MS4 where it discharges to receiving waters of the State.
Owner or Operator – the owner or operator of any MS4 or any activity subject to regulation under the NPDES program.
Permitted Area – the area of a City or County that is covered by the State’s General NPDES Stormwater Permit.  For a City, it refers to the entire City limits; for a County, it refers only to that part of the County contained within an “Urbanized Area” as defined by the latest Decennial Census by the Bureau of the Census.
Point Source – any discernible, confined and discrete conveyance, including but not limited to, any pipe, ditch, channel, tunnel, conduit, well, discrete fissure, container, rolling stock, concentrated animal feeding operation, landfill leachate collection system, vessel or other floating craft from which pollutants are or may be discharged into waters of the State of Georgia.  This does include return flows from irrigated agriculture or agricultural stormwater runoff.
Pollutant – dredged spoil, solid waste, incinerator residue, filter backwash, sewage, garbage, sewage sludge, munitions, chemical wastes, biological materials, radioactive materials (except those regulated under the Atomic Energy Act of 1954, as amended), heat, wrecked or discarded equipment, rock, sand, cellar dirt and industrial, municipal and agricultural waste discharged into water.
Redevelopment – the structural development (construction, installation or expansion of a building or other structure), creation or addition of impervious surfaces, replacement of impervious surface not part of routine maintenance, and land disturbing activities associated with structural or impervious development.  Redevelopment does not include such activities or exterior remodeling.
Waters of the State – any and all rivers, streams, creeks, branches, lakes, reservoirs, ponds, drainage systems, springs, wells, wetlands, and all other bodies of surface and subsurface water, natural or artificial, lying within or forming a part of the boundaries of the State which are not entirely confined and retained completely upon the property of a single individual, partnership, or corporation.
*As defined in the State of Georgia NPDES General Small MS4 Permit (GAG610000)  
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