Getting rid of ant hills in lawn

I have a wild flower 'meadow' as part of my lawn. As this is not mown from April to August/September some pretty big ant nests grow unseen in the long grass. I've been digging them out this spring, pouring boiling water into the wide hole as l go. Is there a better way? How do l know if I've killed the queen? Do the ants, like honey bees, make a new queen if they lose the old one?
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Plenty of birds, including wrens in the garden - minimal effect on the ant population.
I get them in my lawn which is more bother than in a wild meadow (are they even a problem?) but I just scrape the tops off, rake and reseed.