What Does an Environmental Testing Lab Do and How Do You Use One?

An environmental testing lab analyzes physical samples—water, soil, and solid materials—to produce data you can use for regulatory compliance, property decisions, or public health. You use one by choosing a lab accredited for your specific test, following its sampling and preservation instructions, submitting samples with a Chain of Custody (COC) form, and receiving analytical results. This applies whether you're a homeowner checking drinking water for lead, a municipality monitoring wastewater, or an engineer preparing a permit application.

What an Environmental Testing Lab Actually Tests

Labs like First Environmental Laboratories (FEL), based in Naperville, Illinois and incorporated in 1993, organize their work around sample type. According to the lab's own service listing, the main categories are:

Water

• Drinking water
• Groundwater
• Wastewater
• Surface water
• Stormwater

Soil and solid materials

• Soil testing
• Solid materials

The lab states it is accredited to test drinking water, wastewater, soil, and solid materials, and reports having delivered over 2 million accredited results. Its customer base spans landfills, industrial facilities, municipalities, engineering firms, and local/state/federal government—plus the general public.

That range matters when you're choosing a lab: a facility set up for municipal wastewater compliance may handle your homeowner lead sample too, but you should confirm the specific test is within its accreditation scope.

The Services Behind the Results

Analytical testing is the core output, but a working lab provides several supporting services that determine whether your data holds up:

• Sampling instructions — guidance on how to collect a valid sample
• Container preparation — supplying the correct bottle or container for the test
• Preservation and holding times — rules on how a sample must be kept and how quickly it must be analyzed
• Chain of Custody (COC) forms — the documented record of who handled the sample and when
• Data deliverables — the format in which results are reported

FEL also states it works closely with consulting engineers on sampling plans, QA project plans, budgeting, container preparation, sample parameter requirements, permit requirements, analytical methodology, and data deliverables. If your project involves a permit or a regulatory submission, that kind of coordination is often the difference between usable and rejected data.

Why Accreditation Matters

Accreditation is a lab's formal recognition that it can perform specific analyses to a defined standard. For compliance work, it's usually the deciding factor in lab selection.

A concrete example from this lab: FEL states it is accredited to perform lead analysis in drinking water in compliance with Public Act 099-0922 (Illinois). That law governs lead testing in school and daycare drinking water. If you're a school administrator or daycare operator in Illinois, a lab without that specific accreditation can't give you data that satisfies the requirement—no matter how good its general reputation.

The practical rule: match the accreditation to the exact test and the exact regulatory program, not just to the sample type.

How to Submit a Sample: The Working Sequence

The general workflow for using an environmental lab looks like this:

1. Identify the test you need. This may come from a permit, a regulation, a real estate transaction, or a health concern. If you're unsure, tell the lab your situation and let it recommend a package.
2. Request sampling instructions and containers. The lab provides both. Getting the container from the lab matters because preservation chemicals and container material are test-specific.
3. Collect the sample per the instructions. Follow the preservation and holding-time rules—these govern how the sample is stored and how fast it must reach the lab.
4. Complete the Chain of Custody form. This documents the sample's identity and handling history. FEL lists both a standard COC form and a "Contactless COC" option.
5. Deliver the sample within the holding time. Holding times are limits, not suggestions; exceeding them can invalidate the result.
6. Receive and interpret your data. Ask about the deliverable format up front if you need results for a specific report or submission.

Verification point: before you collect anything, confirm with the lab that (a) the test is within its accreditation, (b) you have the right container, and (c) you know the holding time. These three checks prevent most wasted samples.

Common Points Where People Get Stuck

• Wrong container or no preservation. Collecting in a clean jar from home rarely satisfies method requirements.
• Missing the holding time. A sample collected Friday and delivered Monday may be outside the window for some parameters.
• Incomplete COC. An unsigned or vague COC can undermine the legal defensibility of the data.
• Assuming any lab can do any test. Accreditation is test-specific. Lead in drinking water under a state program is a different scope than general water chemistry.
• Not asking about deliverables. If a regulator or engineer needs a particular report format, raise it before sampling, not after.

When to Contact the Lab Directly

Reach out before sampling when:

• You need help building a sampling plan or QA project plan
• Your project has permit requirements you're unsure how to map to tests
• You need to choose a test package (for example, FEL offers a basic homeowner package covering commonly requested drinking water parameters)
• You're coordinating with a consulting engineer on methodology or budgeting
• You need a specific data deliverable format

FEL's listed hours are Monday–Friday, 8:00am–5:00pm, with a phone line at 630-778-1200. The site also lists a "Daycare Bottle Request" and "Homeowner Lead" entry point, which suggests these are common starting points for non-industrial customers.

Choosing a Lab: What to Compare

The lab's stated mission is to provide "top quality and legally defensible analytical data in a timely and efficient manner," and its stated customer list includes both large institutions and the general public. Use that as a starting filter, then verify the accreditation and services that match your specific test.