Looking for a SWPPP consultant in Winthrop, WA? Describe your project once and up to three stormwater consultants who work in Winthrop and Okanogan County get back to you with a quote. It's free and there is no obligation.
Winthrop is home to about 603 people (2024 Census Bureau estimate), a growing community (+20.4% since 2020). With 626 people per sq mi, it is a semi-rural area. Subdivisions and commercial sites here need stormwater permit coverage before grading.
Winthrop at a glance
- Population (Census Bureau estimate, 2024)
- 603 (+20.4% since 2020)
- Rank in Washington
- 228th of 281 cities and towns
- Land area
- 1.0 sq mi
- Population density
- 626 people per sq mi (semi-rural)
- Type
- Town (Winthrop town)
- Main county
- Okanogan County
What to check before hiring in Winthrop
- Permit: in Washington, check the state construction general permit.
- Local rules: Winthrop 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
-
EPA: construction stormwater
Official information and guidance.
-
EnviroCert: CPESC
Official information and guidance.
Services available in Winthrop
-
SWPPP and permit coverage
Preparation of the SWPPP and notice of intent under the construction general permit.
-
Stormwater inspections
Routine and post-storm inspections with reports for the permit.
Frequently asked questions in Winthrop
How much does a SWPPP cost in Winthrop, WA?
It depends on site size, phases and inspections. Describe your project: consultants who serve Winthrop 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 Winthrop 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.