220 ILCS 50/10
(a) Upon notice by the excavator, the underground utility facility owners or operators in or near the excavation or demolition area shall cause a record to be made of the notice and shall mark, by the dig start date and time indicated on the notice, the approximate locations of such facilities so as to enable the excavator to establish the location of the facilities.
For submerged facilities, when the owner or operator of the submerged facilities determines that a proposed excavation or demolition which could include anchoring, pile driving, dredging, or any other water bottom contact for any means performed is in proximity to or in conflict with, submerged facilities located under a lake, river, or navigable waterway, the owner or operator of the submerged facilities shall identify the estimated horizontal route of the submerged facilities, within 15 days or by a date and time mutually agreed to, using marking buoys, other suitable devices, or GPS location data unless directed otherwise by an agency having jurisdiction over the waters under which the submerged facilities are located.
(c) Underground utility facility owners or operators of sewer facilities shall be required at all times to mark the approximate location of those sewer facilities when:
(e) All entities subject to the requirements of this Act shall plan and conduct their work consistent with reasonable business practices.
(1) Conditions may exist making it unreasonable to request that locations be marked by the dig start date and time indicated on the notice.
(f) Underground utility facility owners or operators, whether utilizing in-house or contract locators, and the owner or operator's locate contractors or subcontractors must reasonably anticipate seasonal fluctuations in the number of notices and staff accordingly.
Seasonal fluctuations shall not be considered within the reasonable control of underground utility facility owners or operators and the owner or operator's locate contractors or subcontractors within a place or places, when the notice volumes exceed the historical averages as determined by the reasonable control measurement, for non-emergency requests for utility excavation work for underground utility facility owners or operators, that is not part of a large project that has provided at least a 60-day advance notice.
Only utility excavators when doing utility work may be impacted by this subsection and may incur an additional wait time of up to 2 days.
(g) If an underground utility facility owner or operator receives a notice under this Section but does not own or operate any facilities within the proposed excavation or demolition area described in the notice, that underground utility facility owner or operator, by the dig start date and time on the notice, shall so notify the excavator who initiated the notice in accordance with Section 5.1, and prior to January 1, 2026, may be provided in any reasonable manner including, but not limited to, notification in any one of the following ways:
(h) The underground utility facility owner or operator has discharged the underground utility facility owner's or operator's obligation to provide notice under this Section if the underground utility facility owner or operator attempts to provide notice utilizing the positive response system, in accordance with Section 5.1, and prior to January 1, 2026, by:
(j) For the purposes of this Act, the following color coding shall be used to mark the approximate location of facilities by the underground utility facility owners or operators who may utilize a combination of flags, lathe with colored ribbon, chalk, whiskers, or paint as dig site and seasonal conditions warrant.
Facility type Identification Color
Underground utility facility owner or operator or contract locator use only Electric Power, Distribution and Transmission...................................................................Safety RedMunicipal Electric Systems............................................................Safety RedGas Distribution and Transmission........................................................
High Visibility Safety YellowOil Distribution and Transmission........................................................
High Visibility Safety YellowCommunication Systems.
Safety Alert Orange Water Systems.....................................................................
Safety Precaution BlueSewer Systems.....................................................................Safety GreenNon-potable Water and Slurry Lines.......................................................Safety PurpleExcavator Use Only Temporary Survey...................................................................Safety PinkProposed Excavation.................................................................
Safety White (Black when snow is on the ground)
(from Ch. 111 2/3, par. 1610)
(Source: P.A. 103-614, eff. 1-1-25; 104-417, eff. 8-15-25.)