How St. Louis Handles Water Use Rules: A Practical Guide

St. Louis maintains 204 local ordinances across all categories, and 3 of those deal specifically with water use rules. Here is a breakdown of what the city actually requires, what is prohibited, and where St. Louis falls on the strict-to-permissive spectrum compared to other cities.

Lawn Watering Restrictions

St. Louis has no day-of-week or time-of-day lawn watering restrictions. The city draws abundant supply from the Mississippi and Missouri rivers via the Chain of Rocks plant, so STL Water customers may irrigate without seasonal caps.

Key details: Watering day rule: None. Source rivers: Mississippi, Missouri. Treatment plant: Chain of Rocks. Daily output: ~100M gallons.

Visible water waste like sprinklers running onto the street can trigger a nuisance complaint, but routine lawn irrigation is unrestricted.

The rules around lawn watering restrictions in St. Louis lean permissive, but that does not mean anything goes.

Leak Reporting Duty

St. Louis Water Division requires customers to report visible leaks promptly and maintain private service lines from the curb stop to the meter. MSD Project Clear handles sewer leaks and the lateral repair program funded by a citywide fee.

Key details: Customer line: Curb stop to meter. Lateral program fee: On property tax. Leak hotline: 314-771-4880. Sewer authority: MSD Project Clear.

Failing to repair a known private leak can lead to high water bills, service shutoff for non-payment, and potential property-damage liability if the leak floods neighboring lots.

Recycled Water Rules

St. Louis does not operate a municipal recycled-water network. Greywater reuse on private property is governed by Missouri plumbing code and the city Plumbing Division, and rainwater harvesting for irrigation is allowed under MSD Project Clear stormwater incentives.

Key details: Reclaimed water network: None citywide. Greywater path: Permitted plumbing. Rebate program: MSD Rainscaping. Potable reuse: Not authorized.

Cross-connecting greywater or rainwater to a potable line without a permitted backflow preventer triggers Plumbing Division correction orders and risks revocation of the building's water service.

St. Louis is more permissive than most cities when it comes to recycled water rules. That said, there are still limits.

The Bottom Line

Compared to many U.S. cities, St. Louis gives residents more room on water use rules. 2 of the 3 rules here are rated permissive. But permissive does not mean unregulated. There are still requirements, and the city does enforce them when violations are reported.

This guide is based on St. Louis's current municipal code. Local rules can and do change, so check the individual ordinance pages for the latest details, penalties, and FAQs.