Site Assessment Contractors in Wisconsin
Find contractors in Wisconsin for environmental site assessment, Phase I ESA, Phase II ESA, soil testing, and groundwater investigation. Serving Milwaukee, Madison, Green Bay, Appleton, and communities statewide.
What to Know About Site Assessment in Wisconsin
Two state agencies share responsibility for UST site assessments in Wisconsin. DATCP oversees underground storage tank registration and compliance at the company level, meaning firms performing environmental investigations must hold state registration rather than individual operator certification. When a petroleum release is confirmed or suspected at a regulated facility, the Wisconsin Department of Natural Resources takes the lead on requiring environmental investigation and cleanup. Property transactions involving parcels with current or former USTs routinely trigger Phase I environmental site assessments as part of lender and buyer due diligence, particularly on commercial lots with aging fuel infrastructure.
Demand for environmental site assessments in Wisconsin runs heaviest along the I-94 corridor from Milwaukee through Racine and Kenosha. The Madison metro and Fox Valley cities like Appleton, Oshkosh, and Green Bay round out the busiest markets. Milwaukee's industrial legacy means former manufacturing and gas station parcels frequently need Phase II investigation, while Madison's commercial real estate market generates steady Phase I ESA volume from property transfers. Outside the metros, Wisconsin's dairy and agricultural economy drives assessment work at farm fueling sites and rural cooperatives that stored diesel or heating oil underground for decades. Great Lakes watershed sensitivity adds regulatory weight near Lake Michigan or Lake Superior tributaries, where groundwater contamination can reach surface water faster than in landlocked regions.
A Phase I ESA in Wisconsin typically costs $1,500 to $3,500 depending on the property's size and use history. Phase II investigations involving soil borings and monitoring wells run $3,000 to $9,000, with costs increasing when contamination is suspected at multiple locations across a site. Soil sampling at individual boring locations costs $400 to $1,500, and laboratory analysis adds $200 to $500 per sample. Wisconsin operates the Petroleum Environmental Cleanup Fund Award program, known as PECFA, which may reimburse eligible cleanup and investigation costs at sites with confirmed releases from registered UST systems. PECFA reimbursement is not guaranteed and the application process is time-sensitive, so property owners should confirm eligibility and file early rather than waiting until the investigation is complete.
The site assessment process starts with a Phase I ESA that covers historical records review, aerial photograph analysis, regulatory database searches, and a physical walkthrough of the property. If the Phase I identifies recognized environmental conditions, a Phase II investigation follows with soil borings drilled to the water table and groundwater samples collected from temporary or permanent monitoring wells. Phase II field work in Wisconsin typically takes one to three days, with lab results returning in one to three weeks and the final report delivered four to six weeks after sampling. Winter scheduling can push timelines further because frozen ground conditions between December and March sometimes require specialized drilling equipment or force delays until the spring thaw. Before hiring a firm, ask whether their scope includes DNR correspondence on your behalf and request a written estimate covering what happens if contamination is found during the Phase II.
Site Assessment Contractors in Wisconsin
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Browse Wisconsin Contractors →Frequently Asked Questions
Does Wisconsin require a specific license for UST site assessments?
Wisconsin does not issue an individual UST site assessment license. Instead, DATCP requires company-level registration for firms that perform work on underground storage tank systems. Phase I ESAs must be prepared by an environmental professional meeting ASTM E1527 qualifications. Phase II investigations involving drilling require oversight by a licensed professional geologist or engineer. Hiring a firm that lacks either the DATCP registration or the appropriate professional credentials risks producing a report that the DNR will not accept.
How much does a Phase II environmental site assessment cost in Wisconsin?
A Phase II ESA in Wisconsin typically runs $3,000 to $9,000, depending on how many soil borings and monitoring wells the scope requires. Sites with long petroleum storage histories or multiple former tank locations fall at the higher end because more sample points are needed to define the extent of any contamination. Laboratory analysis costs $200 to $500 per sample, and most Phase II investigations in the state collect between six and fifteen samples. If contamination is confirmed and the DNR requires additional delineation, the investigation phase alone can reach $12,000 to $20,000 before any remediation work begins.
How long does a site assessment take from start to finish in Wisconsin?
A Phase I ESA typically takes two to four weeks from engagement to final report. Phase II field work adds one to three days on site. Laboratory results return in one to three weeks and the completed report is delivered four to six weeks after drilling. If the DNR requires additional investigation rounds after reviewing the initial results, each cycle adds another six to ten weeks. Winter conditions in Wisconsin can extend timelines because frozen ground between December and March may delay drilling or require specialized equipment that adds scheduling lead time.
How does Wisconsin's PECFA program work for petroleum site cleanups?
PECFA is Wisconsin's Petroleum Environmental Cleanup Fund Award program, administered by the Department of Commerce. It may reimburse eligible investigation and remediation costs at sites with confirmed petroleum releases from registered storage tank systems. Eligibility depends on the tank's registration status, the timing of the release report, and whether the property owner followed required notification procedures. Reimbursement is not automatic and typically lags 12 to 24 months after a claim is submitted, so property owners pay upfront and recover costs later. Filing deadlines run from the date of discovery, not from when the work is completed, which means missing the application window can eliminate your eligibility entirely.
What types of Wisconsin properties most commonly need a site assessment?
Gas stations and former fueling sites account for the largest share of UST site assessments in Wisconsin, particularly older stations along state highways and in urban commercial corridors. Agricultural properties with buried diesel or heating oil tanks are a close second, especially dairy farm cooperatives in rural counties that operated underground fuel storage for decades. Commercial real estate transactions involving any parcel with a history of petroleum storage trigger Phase I ESAs as a standard part of lender due diligence. Industrial properties in Milwaukee, Racine, and the Fox Valley also generate consistent demand because manufacturing facilities in those areas frequently had on-site fuel storage that predates modern tank regulations.
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Browse Wisconsin Contractors →For Wisconsin UST regulations, visit the Wisconsin DNR Underground Storage Tanks. Federal requirements are available from the EPA UST Program.