Polluted storm water runoff is often transported to storm drain systems, referred to by the permit as, municipal separate storm sewer systems (MS4s) and ultimately discharged into local rivers and streams without treatment.  EPA’s Storm Water Phase II Rule establishes an MS4 storm water management program that is intended to improve the Nation’s waterways by reducing the quantity of pollutants that are introduced into storm drain systems during storm events and non-stormwater activities.  Common pollutants include oil and grease, salts and deicing materials associated with transportation; pesticides, fertilizers and organic refuse from private and commercial landscape maintenance.  Sediment and various construction related pollutants from construction sites activities and also carelessly discarded trash, such as, paper, plastic bottles and yard waste.  When these pollutants are collected by the miles of roadway gutter and acres urban surfaces, the pollutant volumes are significant and impair the waterways, thereby impairing the recreational use of the water body, contaminating water supplies, and interfering with the habitat for aquatic organisms, and land wildlife. 

In 1990, EPA promulgated rules establishing Phase I of the National Pollutant Discharge Elimination System (NPDES) storm water program.   The Phase I program for MS4s requires operators of “medium” and “large” MS4s, that is, those that generally serve populations of 100,000 or greater, implement a storm water management program as a means to control polluted discharges from these MS4s.  The Storm Water Phase II Rule extends requirement of the NPDES storm water program to certain “small” MS4s but takes a slightly different approach to how the storm water management program is developed and implemented.

General Information
The Riverton City Storm Drain System, also referred to as the stormwater system, falls under the Public Works Department.  The Public Works Director can be contacted at the following address and phone number:

Public Works Director
12526 S 4150 W
Riverton, Utah 84065

Some general information for Riverton City follows:




12 Square Miles

Geographic Description:

Southwest area of Salt Lake   Valley

Receiving Waters:

Jordan River, Midas, Rose and Butterfield Creeks,

Beckstead Ditch and the South Jordan, Utah and Salt Lake, and Utah Lake Distributing Canals

Annual Precipitation:


Type of Community:



40 31’04”N


111 56’21.30”W


The Riverton City Stormwater System consist of various types, including but not limited to: high-back, mountable and ribbon curb, rural dirt shoulder, pipe, manholes, catch basins, detention and retention, drywells, swales, ditches, streams, rivers and canals.

See Link to Stormwater System Inventory

Riverton City Drainage Way History
These paragraphs explain Riverton City’s drainage way history and how it has evolved to the current stormwater system.  These paragraphs also introduce the stormwater challenges.

Three primary creek systems cross Riverton City which flow from the west to the east.  Rose Creek is located at the southern boundary and Midas Creek on the northern boundary.  Butterfield Creek was historically located more-less through the center.  The creek split somewhere around 4000 West and only remnants remain beginning at Redwood Road at 11850 South and 13500 South.   During construction of the canals culverts where not installed for Butterfield Creek and until about 2001 it discharged to the Utah and Salt Lake Canal.  In addition, farming practices slowly filled Butterfield Creek with soil causing Butterfield Creek to shrink and later residential development ultimately erased its existence across most of the City except for the eastern quarter.   Riverton is divided by five canals which flow from the south to the north.  Beginning on the east boundary is the Beckstead Ditch, South Jordan Canal, Utah and Salt Lake Distributing, Utah Lake Distributing and the furthest west is the Welby Canal, also know as the Provo River or Highland Canal. 

Development accelerated in the 1990’s and continues rapidly today.  Like many cities in the Jordan Valley Riverton  was changing from a rural community to an urban city.  Early development occurred with little or no runoff volume management.  Many flood control systems were surface in nature, were shared with gravity irrigations and piped drainage systems were less common.  The primary drainage ways receiving the new urban developments runoff impact were the five canals and Rose and Midas Creeks.  However, by the mid 1990's it was recognized that flood managment was becoming necessary.  

Many of the challenges come from the fact that many subdivisions do not have their own detention systems and many piped systems were installed through private property.  As mentioned,  the canals and creeks received much of this new runoff impact without and flood control management using all the capacity with not place for new development to discharge runoff.   Also Rose and Midas and the canals had to pick up the load from the Butterfield Creek basin and this required expensive piped systems to carry runoff from abandoned Butterfield basin to Rose and Midas where possible.  The remaining runoff had to be discharged to canal requiring overflows from the canals to these creeks to manage the additional runoff of the urbanizing City.

In 2002 UDOT improved 12600 South which included a conveyance from the west side of the City to the Jordan River, however, betterment cost prohibited including much of the already built out Butterfield basin which resulted in a 12600 South system basin that mainly included the 12600 South frontage properties only.

Local Water Quality Concerns
The primary pollution sources in Riverton come from residential and commercial property maintenance, and construction activities.  The occupied residential and commercial activities generally generate organic pollutants from, fallen leaves, grass clippings, fertilizers, organic high landscape fill and landscape waste materials left in the road.  Also it has been noticed much of the fugitive trash is a result of uncovered dumpsters and trash receptacles including tipped receptacles. 

Commercial properties have the potential for other pollution sources and illegal stormwater system connections however, this source investigation and stormwater system mapping is ongoing. 

Construction related pollutants are primarily sediment and pollutants that adhere themselves to sediment, fugitive dust and fugitive trash.  However, construction is highly regulated and a active permit system is effective at managing construction pollution sources.
Currently, Riverton has very few industrial properties.

The residential property maintenance is not regulated via a city permit system therefore oversight is limited and management is primarily public outreach and education.  Commercial properties and private owners associations developed after 2010 are managed by permit however these type properties developed before the permit programs are currently relegated to education and outreach.

Permit Requirements
The permit requirements are found in the Permit for Jordan Valley Municipalities UTS000001.  For your convenience the requirement summary is provided. 

The Stormwater Management Program must:
Reduce the discharge of pollutants to the “maximum extent practicable” (MEP);
Protect water quality;
Satisfy the water quality requirements of the Clean Water Act; and

Storm water management programs must include:
Programs for the six minimum control measures(MCM).  Each MCM requires any number of programs demonstrating the MCM is adequately managed;

  1. Public Education and Outreach
  2. Public Participation/Involvement
  3. Illicit Discharge Detection and Elimination
  4. Construction Site Storm Water Runoff Control
  5. Long-Term Storm Water Management in New Development and Redevelopment Control
  6. Pollution Prevention and Good Housekeeping for Municipal Operations

Measurable goals and interim milestones for the development of each program and a measure of success for the implemented programs(i.e. narrative or numeric water quality measure used to gauge program effectiveness);
The person or persons responsible for implementing or coordinating the specific stormwater program.

The permit has an expiration date and must be renewed upon expiration.  Renewals generally require MCM programs to be added or revised to satisfy any new requirements.  Program development periods are specified by the renewal permit that requires a program development schedule, including milestones and an expectation of operating programs by the end of the permit period. 

The permit requires the City to secure the resources necessary to meet all requirements and to conduct an annual analysis of the human resource, capital improvements and operation expenditures.  The funding details are elaborated in the Stormwater Utility Budget section.

The permit requires an annual assessment of SWMP program implementation and operational program successes.  The assessment is expected to be included in the SWMP document. 
An annual report submitted on a DEQ standard form including certification of compliance is required October 1st. 
Permit Regulation 2.1.5, 4.5, 5.6

SWMP supplementary records(interpreted as support documents) must be kept for at least 5 years and made accessible to the public at reasonable times during regular business hours.  Supplementary records need not be submitted to the NPDES permitting authority unless requested.

SWMP amendments are allowed upon notification and approval by the DEQ.  An amendment request must include an written justification, including but not limited to: performance, infeasibility, application, assessments, non-applicability, changes of conditions and so forth.  Amendments may also be required but DEQ audits. 

The NPDES permit that the operator of a regulated small MS4 is required to obtain is federally enforceable, thus subjecting the Permittee to potential enforcement actions and penalties by the NPDES permitting authority if the permittee does not fully comply with application or permit requirements.  This federal enforceability also includes the right for interested parties to sue under citizen suit provision (section 405) of CWA.

TABLE A lists the programs relative to the corresponding regulation. 

Organization Chart
In review.

Stormwater Utility Citizen Advisory Committee
A stormwater committee was formed January 11th, 2011.  The committee includes the Stormwater Utility Manager, Public Works Director, Stormwater Inspector, the Stormwater Maintenance personnel and 8 members of the community, referred to as the Stormwater Utility Citizen Advisory Committee (SUCAC).

The role of SUCAC is to advise the Stormwater Utility Division in making recommendations to the Riverton City Council on matters pertaining to the Stormwater Utility, Riverton City Stormwater Management Plan, capital facility projects and other matters relating to operation of the Utility.

Stormwater Utility Budget
The permit requires the City to secure the resources necessary to meet all requirements and to conduct an annual analysis of the human resource, capital and operations and maintenance expenditures defined in Section of the Jordan Valley Municipalities (MS4) Permit; No. UTS000001

Funding Sources

1. Stormwater Utility Fee


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