Class I Aerobic Treatment Plants rated at 500 Gallons per day can treat sewage from residential properties up to how many bedrooms?

Class I Aerobic Treatment Plants rated at 500 gallons per day are typically designed to handle sewage from residential properties based on the number of bedrooms. In Illinois, the standard assumption is that each bedroom in a residence contributes to the sewage flow. According to regulations and guidelines, a common estimate is that a residential property generates around 150 gallons of sewage per bedroom per day.

For a system rated at 500 gallons per day, the calculation to determine how many bedrooms it can effectively serve is made by dividing the total daily capacity (500 gallons) by the average gallons produced per bedroom (150 gallons). This results in a capacity for approximately 3.33 bedrooms. However, the common approach allows for the rounding up or consideration of additional factors like occasional guests or variances in usage patterns.

In practice, for the design and permitting purposes, it is generally accepted that such a system could comfortably serve residential properties of up to 4 bedrooms, accounting for varying usage patterns and ensuring there is adequate treatment capacity without overwhelming the system. Thus, this consideration firmly supports the option indicating that a 500 gallons per day Class I Aerobic Treatment Plant can treat sewage from a residential property with 4 bedrooms effectively.