Infiltration/Inflow

Infiltration/Inflow (I/I or I&I) is the process of groundwater, or water from sources other than domestic wastewater, entering sanitary sewers. I/I causes dilution in sanitary sewers, which decreases the efficiency of treatment, and may cause sewage volumes to exceed design capacity. Although inflow is technically different from infiltration, it may be difficult to determine which is causing dilution problems in inaccessible sewers. The United States Environmental Protection Agency defines the term infiltration/inflow as combined contributions from both.^[1]^[2]

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U.S. Environmental Protection Agency (EPA), Washington, D.C. Code of Federal Regulations. "Part 35—State and Local Assistance."
- "Definitions; Excessive inflitation/inflow." 40 CFR 35.2005 (b)(16). 40 CFR 35.2005
- "Grants for Construction of Treatment Works; Infiltration/Inflow." 40 CFR 35.2120
^ Guide for Estimating Infiltration and Inflow (PDF) (Technical report). U.S. EPA New England. June 2014. Retrieved 8 May 2023.

[EPA_definition-1] U.S. Environmental Protection Agency (EPA), Washington, D.C. Code of Federal Regulations. "Part 35—State and Local Assistance."
"Definitions; Excessive inflitation/inflow." 40 CFR 35.2005 (b)(16). 40 CFR 35.2005

"Grants for Construction of Treatment Works; Infiltration/Inflow." 40 CFR 35.2120

[2] "Definitions; Excessive inflitation/inflow." 40 CFR 35.2005 (b)(16). 40 CFR 35.2005

[3] "Grants for Construction of Treatment Works; Infiltration/Inflow." 40 CFR 35.2120

[2] Guide for Estimating Infiltration and Inflow (PDF) (Technical report). U.S. EPA New England. June 2014. Retrieved 8 May 2023.

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