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Septic System Design Flow Rate Specifications - Sewage flow rates for septic designers
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• What wastewater design flow rate should be used by septic system designers
• Septic flow rates for homes using either traditional (pre 1979) and more recent (water saving) plumbing fixtures

Section 3 of the septic design regulations discusses sewage flow rates to be used in designing onsite wastewater treatment facilities for individual households. This document uses the New York State wastewater treatment standard for individual household septic systems (Appendix 75-A) to provide an example of state regulated design and installation of both conventional tank and leach field septic systems and alternative septic system designs, including raised septic systems, septic mound systems, intermittent sand filter septic systems, and evaportion-transpiration septic systems. Citation of this article by reference to this website and brief quotation for the sole purpose of review are permitted. Use of this information at other websites, in books or pamphlets for sale is reserved to the author. Technical review by industry experts has been performed and is ongoing - reviewers welcomed and are listed at "References." © Copyright 2008 Daniel Friedman, All Rights Reserved. Information Accuracy & Bias Pledge is at below-left. Use the links at page left to navigate this document or to go to Other Website Topics. Green links at left show where you are in our document & website.

Title: New York State Septic Regulation Appendix 75-A.3 - Sewage flows - Effective Date: 12/01/90

Section 75-A.3 Sewage Design Flow Rates

The following table gives septic system design flow rates that shall be assumed by septic system designers, giving flows in gallons of wastewater per day per bedroom in the home served by a private onsite wastewater disposal system, that is, a private septic system. Different septic design flow rates are assumed depending on the modernity and efficiency or water usage rate of the plumbing fixtures in the home. --DF

(a) Roof, footing, garage, cellar and surface water drainage must be excluded from the system. Water softener, water recharge and backwash wastes normally are not to be discharged to the system unless a separate subsurface discharge to an area 250 feet from wells or water courses is unavailable.

(b) Minimum design flows for various configurations of plumbing fixtures shall be as shown in Table 1.

More expert information on this topic

More Information on Septic System Diagnosis, Maintenance, & Repair

• The Septic System Information Website home page for this topic
• Septic Systems Inspection, Testing, & Maintenance- online textbook. Detailed how to inspect, maintain, repair information
• The Home Buyer's Guide to Septic Systems
• Septic Tank Pumping Guide: When, Why, How to pump the septic tank
• Home & Outdoor Living Water Requirements
• Septic Tank Capacity vs Usage in Daily Gallons of Wastewater Flow, calculating required septic tank size, calculating septic tank volume from size measurements
• How Big Should the Leach Field Be? - table of soil percolation rate vs. field size
• Septic System Drainfield Absorption System Biomat Formation - what leads to drain field clogging and expensive drainfield repairs
• Table of Required Septic & Well Clearances: Distances Between Septic System & Wells, Streams, Trees, etc.

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