Looking for a SWPPP consultant in Onawa, IA? Describe your project once and up to five stormwater consultants who work in Onawa and Monona County get back to you with a quote. It's free and there is no obligation.
Onawa is home to about 2,795 people (2024 Census Bureau estimate), a shrinking community (−3.9% since 2020). With 531 people per sq mi, it is a semi-rural area. Subdivisions and commercial sites here need stormwater permit coverage before grading.
Onawa at a glance
- Population (Census Bureau estimate, 2024)
- 2,795 (−3.9% since 2020)
- Rank in Iowa
- 128th of 940 cities and towns
- Land area
- 5.3 sq mi
- Population density
- 531 people per sq mi (semi-rural)
- Type
- City (Onawa city)
- Main county
- Monona County
What to check before hiring in Onawa
- Permit: in Iowa, check the state construction general permit.
- Local rules: Onawa may add its own erosion control permit.
- Records: keep inspection reports on site.
- Price drivers: site size, phases, inspection frequency and duration.
Useful official resources
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EPA: construction stormwater
Official information and guidance.
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EnviroCert: CPESC
Official information and guidance.
Services available in Onawa
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SWPPP and permit coverage
Preparation of the SWPPP and notice of intent under the construction general permit.
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Stormwater inspections
Routine and post-storm inspections with reports for the permit.
Frequently asked questions in Onawa
How much does a SWPPP cost in Onawa, IA?
It depends on site size, phases and inspections. Describe your project: consultants who serve Onawa reply with a quote.
How long does it take?
Plans often take days to a couple of weeks, plus the permit review.
What happens at the end?
A notice of termination is filed once the site is stabilized.
Which stormwater consultants will contact me?
Up to five independent stormwater consultants who serve Onawa and the surrounding area, chosen for the service you need. Your details are shared only with your consent.
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2024) and Gazetteer Files (public domain), imported on 10/31/2026. Figures describe the incorporated place or county as published; they are shown for information only.