Cottleville Tap Water Quality: Is It Safe to Drink? (2026 Report)

Cottleville, Missouri tap water receives a grade of B (65/100), which is considered good. Out of 66 contaminants tested, none exceed EPA maximum contaminant levels (MCLs) and 1 exceed health guidelines (MCLGs). While the water meets federal standards, some residents may still choose to use a filter for additional peace of mind.

Of the 66 contaminants tested in Cottleville's water supply, the most notable include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.

Yes, Cottleville has 36 EPA violation(s) on record, with the most recent in 2016. Violation types include MCL, Other, MR. 16 of these are health-based violations, which are the most serious category.

Cottleville water meets EPA standards, so a filter is not strictly necessary. However, some residents prefer the added security of a water filter. EPA health goals (MCLGs) are stricter than legal limits and are set at levels with zero expected health risk. 1 contaminant(s) exceed these stricter goals.

Cottleville's drinking water is sourced from groundwater and supplied by MO AMERICAN MEXICO and 2 other water system(s). The system serves approximately 15,706 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.

Under the Safe Drinking Water Act (SDWA), water utilities are required to regularly test for over 90 contaminants. Testing frequency varies by contaminant — some are tested monthly, others quarterly or annually. Cottleville's water systems must report results to the EPA and publish an annual Consumer Confidence Report (CCR). The data on this page reflects the latest available EPA testing data.

Cottleville's water quality score of 65/100 earns a grade of B, which is considered good. This is an above-average score compared to many cities nationwide. Visit our Missouri state page to see how all cities in the state compare.

If you have concerns about Cottleville's tap water, consider these steps: (1) Request your utility's annual Consumer Confidence Report for detailed local data. (2) Get your water independently tested through a state-certified laboratory. (3) Consider an NSF-certified water filter rated for the contaminants found in your area. (4) Contact your water utility (MO AMERICAN MEXICO) with specific questions. (5) Report water quality issues to your state drinking water program or the EPA Safe Drinking Water Hotline at 800-426-4791.