Iowa Hydrovac & Excavation Regulations
Excavation law, 811 notice rules, tolerance zone and penalties for Iowa, with citations to the statutes and the one-call center.
Last reviewed October 18, 2026. General information only, not legal advice. Laws change and vary by locality and utility, so always contact 811 and confirm current requirements before you dig. Read the disclaimer
Iowa at a Glance
Call 811 before you dig
- One-call center
- Iowa One CallVisit website for Iowa One Call (opens in a new tab)
- Phone
- 811 or 800-292-8989
- Notice required
- 48 hours, counted from 6:00 a.m. on the next business day after the center receives the notice and excluding Saturdays, Sundays and legal holidays; notice is valid for 25 calendar days after the 48-hour period ends
- Tolerance zone
- 18 inches
- Ticket life
- 25 calendar days after the 48-hour period ends
- Maximum penalty
- Natural gas and hazardous liquid pipelines: up to $10,000 per violation per day, max $500,000; other underground facilities: up to $1,000 per violation per day, max $20,000
Iowa requires excavators to notify Iowa One Call at least 48 hours before digging, counted from 6:00 a.m. on the next business day and excluding weekends and legal holidays. The law is Iowa Code Chapter 480 (Underground Facilities Information).
Tolerance Zone
18 inches
The horizontal location of a facility includes 18 inches on either side of it (Iowa Code 480.4). Excavators must use due care.
Key Regulations
Iowa One Call Law (Underground Facilities Information)
Requires notice before excavation and sets marking and safe digging standards.
Citation: Iowa Code Chapter 480
Operator Marking
Operators must mark within the 48-hour notice period.
Citation: Iowa Code 480.4(3)(a)(1)
Excavation Near High-Pressure Pipelines
Unless agreed otherwise in writing, no excavation within 25 feet of a pipeline operating at 150 psi or more and 2 inches or more in diameter without the operator's representative present (excavation may proceed with due care if the representative fails to appear and the excavator notifies the operator).
Citation: Iowa Code 480.4(3)(a)(3)
Recent and Upcoming Changes
- 2024 Iowa Acts ch. 1120 amended sections 480.1, 480.3, 480.4 and 480.6, including civil penalties.
- The Iowa Utilities Board was renamed the Iowa Utilities Commission (2024 Iowa Acts ch. 1170).
Penalties for Violations
Civil penalties are enforced by the attorney general, with the Iowa Utilities Commission investigating.
Maximum penalty: Natural gas and hazardous liquid pipelines: up to $10,000 per violation per day, max $500,000; other underground facilities: up to $1,000 per violation per day, max $20,000
Licensing and Permits to Confirm
Licensing depends on the type of work and the city or county. Treat these as items to check with the Iowa licensing board and your local permit office before bidding work.
- Iowa contractor registration as required
- Compliance with Iowa Utilities Commission regulations
- Liability insurance as required by law and by contract
Sources
Last reviewed October 18, 2026. Facts on this page were checked against these statutes, rules and one-call center pages.
Disclaimer
This guide is general information about state excavation and one-call (811) laws. It is not legal advice, and reading it does not create an attorney-client relationship.
Laws, rules and one-call center procedures change, and requirements can differ by city, county, utility operator and type of work. Facility operators may also set their own requirements. Before any excavation, contact the state one-call center through 811 and confirm current requirements in the statute and rules cited on this site. For questions about your obligations or liability, consult the statute directly or a licensed attorney in the state where the work takes place.
Hydrovac News makes no warranty that this information is complete, current or accurate, and is not liable for any loss or damage resulting from reliance on it.
Hydrovac Jobs in Iowa
Browse current hydro excavation job openings in Iowa.
Need Hydrovac Services in Iowa?
Request hydro excavation service in Iowa through Hydrovac Hotline, our sister site.
