CONCURRENCY is a program implemented by Summit County to protect both the Water Systems and the Public, who rely on said water services. In this context – the term Concurrency describes “a water supplier’s ability to develop water sources, at a rate needed to safely keep up with (or stay concurrent) with any new growth demands imposed upon it.”
It is also very important to remember that Concurrency examines current and projected Water Source capacities and demands only, and does not take into consideration other possible servicing constraints, such as Legal issues relative to contracts or supply, Water Rights limitations, Water Quality issues, Storage deficiencies, and other possible Distribution System constraints, i.e. pumping and pipe pressure losses, etc. These issues should be regularly evaluated by each water system individually, and factored into a reasonable reserve factor beyond the surplus capacities provided in this Concurrency program.
SIMPLIFICATION – In 2017, Summit County Health Department adopted a new Concurrency reporting system. This newer report is greatly simplified from previous submission requirements. It is designed to provide only key information for County review, as well as information which would also be extremely valuable to water system personnel for their own review and performance monitoring. This new program also makes the program more user friendly for public review.
While this program may seem complex – Water Concurrency’s end result is simply a number which represents the surplus of water available in the system, and which translates into an approved number of equivalent residential connections which can be serviced by that surplus. This is a number which can change from year to year, hence the reason for annual updates. After a water supplier submits their data, it is then reviewed by the Water Concurrency Officer and Engineer, and then certified by the Summit County Health Department. The relevant water system then issues Water Commitment of Service Letters, as backed by the approval, to new developers or homeowners as a condition to recieving a building permit.
The submissions show the total water source capacity in Gallons per Minute, less the current Customer Demands, an all forms, i.e. municipal, agricultural, irrigation, etc. The difference of these two numbers on the “ledger” represents the balance of surplus water available for new growth. The water system also projects future demands as well as future water development projects to arrive at a projection of future capacity.
Finally – calculations are always based on the peak demand period or month as experienced for the water system, since this is the time that all water sources need to be fully operational and compliant with all regulations to meet these demands. If the peak period cannot be met, then the system would be deemed insufficient in capacity, and would need to purchase water by contract, or develop new water source(s).
Gallons: Use gallon figures from your records or convert to them if needed. If your system records are in 1,000 gallon units, add the appropriate 3 zeros after the figures.
ERC: “Equivalent Residential Connection”, and is a standardized unit of water demand which equates to the consumption of an average residential customer. This unit is typically unique to each system. It is used to identify the impact or quantity a non-residential type user has on the system, i.e. commercial entity equals 12 ERC’s, etc.
Peak Month: The highest Supply Production Month or User Demand Month on a system. The two could possibly be on different months, but not typically.
Peak Day: The peak Supply or Demand day on a system, assumed to be during the peak month. If meters are not read every day, it is assumed to be the Peak Month volume, divided by the number of days, and multiplied by a factor of 1.3 to arrive at an estimated peak day. This number is divided by 1,440 to arrive at a peak day GPM.
M&I Water: A common industry term used to signify typical Municipal, Commercial, and Industrial water users served by a system. This is usually where the vast majority of metered customers lie, and excludes agricultural and large irrigation type customers.
Peaking Factor: This is a ratio of the Current Year Peak Month to the Average Month, and is often used to determine the impact irrigation or non-typical (large) types of users have on a water system. A typical system should have a peaking factor of approximately 2.0.
The Summit County Concurrency Ordinance covers the unincorporated areas of western Summit County, Utah, and more particularly the properties serviced by public and private water systems in that region. Park City Municipal is not included in the program.
The water systems currently regulated by this ordinance (including access to their WEB sites) are as follows:
The annual Concurrency Reviews as performed by the District Engineer, (representing the Summit County Health Department) for each water system are found below. These reviews may make adjustments or suggestions to each system, depending on the circumstances of each system. For assistance with with unit definitions used in these reports, please click here. An archive of concurrency reviews from previous years can be found below.
2026 and Archive Of Previous Annual Concurrency Reviews
The following two water systems have been deemed exempt from future submissions under the Concurrency Ordinance because they are over 90 percent built out:
