Stormwater Management: Olathe vs Shawnee
How do stormwater management rules compare between Olathe, KS and Shawnee, KS?
Olathe has fewer restrictions than Shawnee.
Olathe, KS
Johnson County
Olathe requires stormwater management for new development and significant property modifications. Runoff must be controlled on-site through retention, detention, or infiltration systems.
View full Olathe rules →Shawnee, KS
Johnson County
Kansas regulates stormwater discharges statewide through KDHE's NPDES program under K.S.A. 65-164 and 65-165, requiring construction, industrial, and municipal separate storm sewer system permits that cities must enforce as a delegated state program.
View full Shawnee rules →Key Facts Comparison
| Fact | Olathe | Shawnee |
|---|---|---|
| New Development | Stormwater plan required | - |
| Runoff Control | On-site retention | - |
| Maintenance | Owner responsibility | - |
| Topic | Stormwater | - |
| Statute | - | K.S.A. 65-164 et seq. |
| Regulator | - | KDHE Bureau of Water |
| Construction threshold | - | 1+ acre disturbance |
| Max penalty | - | $10,000 per day |
Highlighted rows indicate differences between cities.
Olathe FAQ
Do I need a stormwater plan for my project?
Generally required for new construction and major renovations that increase impervious surface area. Small residential projects may be exempt.
What is an illicit discharge?
Any non-stormwater substance entering the storm drain system, including paint, oil, chemicals, or sediment. Report violations to Olathe public works.
Shawnee FAQ
When does a Kansas project need a stormwater permit?
Construction disturbing one or more acres, regulated industrial facilities, and MS4 cities need KDHE NPDES coverage under the statewide stormwater program.
Can Kansas cities have stricter stormwater rules?
Yes, cities may add stricter local stormwater controls, but they cannot weaken KDHE permit conditions or federal Clean Water Act discharge limits.
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