Looking for a SWPPP consultant in Allison, IA? Describe your project once and up to three stormwater consultants who work in Allison and Butler County get back to you with a quote. It's free and there is no obligation.
Allison is home to about 937 people (2024 Census Bureau estimate), a shrinking community (−3.0% since 2020). With 320 people per sq mi, it is a semi-rural area. Subdivisions and commercial sites here need stormwater permit coverage before grading.
Allison at a glance
- Population (Census Bureau estimate, 2024)
- 937 (−3.0% since 2020)
- Rank in Iowa
- 296th of 940 cities and towns
- Land area
- 2.9 sq mi
- Population density
- 320 people per sq mi (semi-rural)
- Type
- City (Allison city)
- Main county
- Butler County
What to check before hiring in Allison
- Permit: in Iowa, check the state construction general permit.
- Local rules: Allison 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 Allison
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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 Allison
How much does a SWPPP cost in Allison, IA?
It depends on site size, phases and inspections. Describe your project: consultants who serve Allison 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 three independent stormwater consultants who serve Allison 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.