科罗拉多州朗蒙特市收取水和废水系统开发费 （SDFs）给所有新客户。这些费用的目的是收回一定比例的收入 服务新客户所需的水和废水系统容量成本。虽然 这种结构被认为对绝大多数新客户、城市员工是公平的 相信现有的结构对于某些具有 不同寻常的水和废水特性。公用事业公司的水和废水SDF历史上是按水收费的 米大小。根据水表大小对用水量进行的全面审查显示了一个明确的用水模式 非住宅电表尺寸过大。极少数情况下是完全胜任的 正在使用的仪表。按照传统的费率和收费方法，现有 能力单位已被用于开发SDF。商业账户分析 四英寸的水表显示67%的流量没有超过一个小时的连续流量 三英寸米（每月2.3毫克）。在过去的几年里，这座城市吸引了打算使用 大量的水，并充分发挥其潜在的水表容量。在许多方面 在这些案例中，他们的流程排放高浓度废水。市政府工作人员很清楚，这些客户不是 在现有条件下，全额支付其对水和废水系统的影响 SDF。为所有新的非居民客户开发了新的SDF，预计 水流量超过安全峰值或连续流量三英寸 水表。SDF是通过股权收购开发的- 在方法和方法上都是基于 水系统平均日、高峰日、高峰小时容量和废水处理 工厂高峰月流量和强度能力。 本文介绍了SDFs和非住宅废水的发展 给出了典型客户的结果SDF示例。这张纸是实用的 希望对大型企业实施公平影响费的经理和财务总监 非居民客户。包括表格，如图所示。

The City of Longmont, Colorado charges water and wastewater system development fees (SDFs) to all new customers. The fees are designed to recover a proportionate share of the costs of water and wastewater system capacity required to serve new customers. Although this structure is believed to be equitable to the vast majority of new customers, City staff believed that the existing structure was not cost responsive for certain large users with unusual water and wastewater characteristics. The utilities' water and wastewater SDF's were historically charged according to water meter size. A comprehensive review of water use by meter size showed a clear pattern of oversizing of nonresidential meters. In very few instances was the full capacity of the meter being used. In accordance with traditional rate and fee methodology, existing capacity units had been used in developing SDF's. An analysis of commercial accounts with four-inch water meters indicated 67% did not exceed the continuous flow rate for a three inch meter (2.3 MG per month). In the past few years the City has attracted nonresidential customers who intend to use large quantities of water and fully maximize their potential meter capacity. In many cases, their processes discharged highly concentrated effluent. It was clear to City staff that these customers were not paying the full share of their impact on the water and wastewater systems under existing SDF's. A new SDF was developed for all new nonresidential customers with an estimated water flow rate in excess of either the safe peak or continuous flow capacities for a three inch water meter. The SDF's were developed using the equity buy-in method and are based on water system average day, peak day, and peak hour capacities and wastewater treatment plant peak month flow and strength capacities. This paper shows the development of large nonresidential water and wastewater SDFs and gives examples of resulting SDFs for typical customers. This paper is for utility managers and financial directors who wish to implement fair impact fees to large nonresidential customers. Includes tables, figure.