My goal is to determine the amount of lead leaching from the service lateral between the curb box and the meter, which is the part that I would have to pay to replace.

Is my method likely to get me an accurate reading?

Procedure:
1. Ensure that 2.5-gallon plastic bucket is clean, and rinsed repeatedly with plain tap (or distilled?) water.
2. Draw no water for 6 hours.
3. Draw 2 gallons water into bucket.
4. Stir water in bucket.
5. Draw water from bucket to sample container.
6. Seal sample container and submit sample for testing.

I've read a lot of online PDFs and procedures about taking samples of water to test for lead. Most of them seem to say don't flush in advance, the water needs to sit in the pipe undisturbed for some number of hours, and draw from the most-used or closest faucet to the meter.

In my case, I have:

--50 feet of 1" ID lead pipe from the curb box to the meter
--75 feet from the main to the meter
--There is a brass boiler drain on the copper pipe about 1' on my side of the meter
--The first faucet is the kitchen, about 25 feet of 3/4 Type L copper from the meter to the fixture stop.
--Fixtures and fittings all installed circa 2000 AD
--All tubing on my side of the meter is soldered copper
--All solder is lead-free

I calculated the lead pipe capacity as 2.0 gallons, curb box to meter, and 3.1 gallons, main to meter. (Since the water utility is replacing the main-to-curb box portion anyway, I don't think I care about the water in that section of pipe.)

600" length @ 1" diameter = 471 cubic inches = 2.0 gallons

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Links to the State of Wisconsin Plumbing Code:
[docs.legis.wisconsin.gov]
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I am not a plumber.
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If you're that worried about lead in your water just replace the service from the curb stop to your meter.

I am seeking knowledge on testing methods from others with personal or professional experience.

I am not seeking advice on what to do with that information, but thanks nonetheless for your suggestion.

*******************************
Links to the State of Wisconsin Plumbing Code:
[docs.legis.wisconsin.gov]
*******************************
I am not a plumber.
*******************************

Talk to your local health department and ask what there test procedure would be.