The standard reference for US impact fees reports figures effective August 2019

It is a genuinely useful document and the best free national resource in this field. It is also seven years old, and fee schedules do not sit still for seven years.

Why seven-year-old fee data is not merely old

It is unsafe, and this dataset contains the receipts. Every item below was found while compiling the 18 counties published free on this site:

• Three separate fee families changed inside 60 days in one county in this set.
• Osceola County's mobility fee rose 117% — from $9,999 to $21,710 — under an ordinance adopted in September 2024. A 2019 figure understates that one line by more than $11,000.
• Weld County's road impact fee moved from $3,567 to $3,794 between 2025 and 2026, and its plan review went from 65% to 70% of the building fee. Small moves, but they compound.
• Little Thompson Water District reset its entire tap schedule on April 16, 2026, effective the next day. A single board vote.
• North Weld County superseded its January 2026 schedule mid-year with an amended July 2026 one, because its raw water fee is market-indexed and reset at board meetings.

Being current is not the hard part. Being traceable is.

Old data at least fails loudly. The failure mode that costs money is data that looks current and is wrong. Each of these was found in a live, authoritative-looking source:

• Polk County still hosts a pre-adoption draft schedule with columns headed "100% of Study Rate." Those are 2027 rates. Using them overstates by $2,085 today.
• Manatee County struck out its adopted 2026–2028 phase-in. The deletion is a scanned redline, invisible to text extraction, so any automated read shows it as still in force.
• Pasco County's rate tables are flat images inside the PDF. Extraction returns nothing, then silently falls back to a superseded schedule that reads 21% low.
• Central Weld's entire fee table is an image behind a signed URL that appears only in an og:image attribute. Text extraction returns literally nothing.
• A third-party legal-code mirror returned one county's impact fees off by 2.4×, in a clean page that looked entirely authoritative.

What this site is, and what it is not

It is not a national survey. 270 communities is a far broader sample than 18 counties, and anyone needing national breadth should use the 2019 survey with its age firmly in mind. What this is: a much smaller set compiled to a standard the national surveys do not attempt — every single fee line carries an effective date and a direct link to the adopted ordinance, resolution or published schedule it came from. 317 line items, 321 source documents, no third-party legal-code mirrors used anywhere. Where a figure could not be verified it is reported as a gap, never estimated, and the county total is labelled a floor.