Looking for a SWPPP consultant in New Castle, CO? Describe your project once and up to three stormwater consultants who work in New Castle and Garfield County get back to you with a quote. It's free and there is no obligation.
New Castle is home to about 4,894 people (2024 Census Bureau estimate), a stable community (−0.4% since 2020). With 1,961 people per sq mi, it is a suburban area. Subdivisions and commercial sites here need stormwater permit coverage before grading.
New Castle at a glance
- Population (Census Bureau estimate, 2024)
- 4,894 (−0.4% since 2020)
- Rank in Colorado
- 80th of 271 cities and towns
- Land area
- 2.5 sq mi
- Population density
- 1,961 people per sq mi (suburban)
- Type
- Town (New Castle town)
- Main county
- Garfield County
What to check before hiring in New Castle
- Permit: in Colorado, check the state construction general permit.
- Local rules: New Castle 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 New Castle
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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 New Castle
How much does a SWPPP cost in New Castle, CO?
It depends on site size, phases and inspections. Describe your project: consultants who serve New Castle 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 New Castle 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.