Stormwater

Household Hazardous Waste

All household hazardous waste including household chemicals, cleaning supplies, motor oil, paint and spray cans should be taken to the Riley County Hazardous Waste Facility for disposal. These items can pollute stormwater if disposed of in other manners.

Manhattan's MS4 Stormwater Permit (NPDES)

Manhattan's MS4 Stormwater Permit outlines the minimum requirements the City needs to meet in order to help conserve and protect stormwater resources within our City.  It covers activities including public outreach, spill investigations and responses, and design standards for new construction.

Proposed Stormwater Management Criteria Update (2022)

The City is considering the adoption of an updated Stormwater Management Criteria and related Standard Drawings and Specifications for stormwater infrastructure. The public comment period is now open.

Stormwater Management Plan, 2021-2024

Our Stormwater Management Plan (SMP) gives more detailed information about how the City intends to comply with our permit responsibility, including a listing of specific programs, measurable goals, and schedules.  The plan can be updated on a yearly basis. This plan was prepared in compliance with our current NPDES MS4 permit, as issued by KDHE, which covers our activities from November 2019 through October 2024.

2021 Annual Report, Manhattan Stormwater Compliance

To document our compliance, the City provides KDHE with an annual report listing the activities it sponsored and its performance on measurable goals. This is the 2021 report. The 2022 calendar year report will be available by March 2023.

Technical Information

Information on stormwater criteria and standards for contractors and developers.

Water Quality


The City of Manhattan samples water from the Kansas River and Wildcat Creek following significant rainfall. The samples are then tested for a certain number of pollutants. Learn how you can help lower the level of pollutants in the water by changing a few household practices.