If I mail the bill by the Due Date, will it be late? No. The District processes by the post-marked date. By casey dolan|2025-01-08T16:02:34-08:00January 8, 2025|Groundwater Billing| Share This Story, Choose Your Platform! FacebookXRedditLinkedInWhatsAppTelegramTumblrPinterestVkXingEmail About the Author: casey dolan