Excellent Water Quality
Water Quality Summary
Tap water quality in Mountlake Terrace, Washington (98043) receives an overall grade of A (Excellent) with a score of 87 out of 100, based on analysis of EPA compliance data, contaminant testing, and violation history. This is 12 points above the Washington state average of 76. Compared to the national average (75), this area performs significantly better. The area is served by Mountlake Terrace City Of, a surface water system providing water to approximately 26,402 people.
A score of 87/100 means the water supply in Mountlake Terrace, WA meets or exceeds all EPA standards with minimal issues. Contaminant levels are well within safe limits, and the water system has maintained a strong compliance record. While no water supply is guaranteed perfect at the tap due to household plumbing, this is among the best-scoring areas in the country.
Common Questions
Based on EPA data, tap water in Mountlake Terrace, Washington receives a grade of A (Excellent) with a score of 87/100. This indicates the water meets federal standards and has relatively few concerns. However, individual homes may still have localized issues such as lead from old plumbing.
ZIP code 98043 is served by 1 water system using surface water sources, providing water to approximately 26,402 people. Surface water systems are more susceptible to contamination from agricultural runoff, industrial discharge, and weather events, but typically undergo more extensive treatment including filtration and disinfection.
No lead data is currently available for ZIP code 98043. This may mean lead testing results haven't been reported recently, or the serving water system uses monitoring waivers. You can request a free lead test kit from most water utilities or purchase a certified home testing kit.
No PFAS ("forever chemicals") were detected in water systems serving Mountlake Terrace, Washington during the most recent EPA monitoring period (UCMR5). However, not all water systems have been tested for all PFAS compounds, and new contamination can occur over time.
Water systems serving Mountlake Terrace, Washington have received 3 violations in the last 5 years. Violations can range from paperwork issues (monitoring & reporting) to serious health-based violations where contaminant levels exceeded safe limits. Review the violation details above for specifics.
Water in Mountlake Terrace, Washington shows no major contaminant concerns based on available data. A basic carbon filter can improve taste and reduce chlorine. For extra peace of mind, an NSF-certified pitcher filter or faucet-mount filter provides an affordable layer of protection.