District of Columbia Tap Water Quality Report

The tap water quality in District of Columbia currently sits near the national average, registering a composite safety score of 68.2/100 across 286 monitored ZIP codes. While a significant portion of the state maintains adequate water quality and full compliance with federal standards, 0% of ZIP codes in District of Columbia have received a failing grade due to recent compliance issues. Monitoring data from the EPA indicates that while the majority of residents receive safe tap water, localized issues remain a challenge for several municipal systems.

The state's water infrastructure has experienced significant compliance hurdles recently, logging a staggering 1,644 health-based violations over the past 5-year monitoring window out of 9,042 total violations. When a state registers this volume of health-based violations, it often points to systemic challenges such as aging distribution networks, agricultural runoff affecting groundwater, or underfunded rural water systems. District of Columbia Water and Sewer Authority is responsible for enforcing corrective actions and penalizing systems that repeatedly fail to meet safe drinking water standards.

Fortunately, the risk of widespread lead exposure in District of Columbia's municipal water is relatively low compared to other states, with only 5.9% of ZIP codes falling into the High or Very High risk categories. However, because lead primarily enters drinking water through the corrosion of individual home plumbing rather than the main municipal supply, residents living in homes built prior to 1986 should still exercise caution. Using a standard carbon block filter and running the tap for 30 seconds each morning remains a recommended best practice for all households.