Tap Water Safety Report for Mount Prospect, Illinois
Mount Prospect, Illinois tap water scored 68/100 (C+) based on EPA data. While the water meets minimum EPA standards, 3 contaminant(s) are at elevated levels worth monitoring.
Overall Score
68/100
Grade: C+
Contaminants Tested
10
All within limits
EPA Violations
1
1 active
Water Source
surface
Surface water
Population Served
57,546
residents
Water Systems
1
serving this area
3 contaminant(s) are approaching EPA limits and should be monitored.
Detected level
49.2668 ug/L
62% of EPA limit
Health effects: Disinfection byproducts linked to increased risk of bladder cancer and reproductive issues with long-term exposure.
Detected level
0.7465 mg/L
57% of EPA limit
Health effects: Can cause gastrointestinal distress at high levels. Long-term exposure may damage the liver and kidneys.
Detected level
32.5542 ug/L
54% of EPA limit
Health effects: Disinfection byproducts associated with increased cancer risk and potential reproductive effects.
Mount Prospect's water system has 1 unresolved violation(s) with the EPA:
Based on Mount Prospect's water quality data, here are our specific recommendations:
With 3 contaminant(s) at elevated levels, a certified pitcher or faucet filter provides an affordable layer of protection. Look for NSF/ANSI certification.
City water reports reflect water leaving the treatment plant. Your home pipes may add contaminants, especially in older buildings. Test at the tap for the most accurate picture.
How contaminant levels compare to EPA limits (50% of overall score)
EPA violation history and enforcement actions (30% of overall score)
Water system infrastructure and source quality (20% of overall score)
Mount Prospect's water scored 68/100 with 3 contaminant(s) at elevated levels. Children are more vulnerable to water contaminants due to their lower body weight and developing systems. We recommend using a certified water filter for any water used for baby formula, cooking for children, or children's drinking water. A pitcher filter with NSF certification is an affordable first step.
Mount Prospect's water has been tested for 10 contaminants. None currently exceed EPA maximum contaminant levels. The most notable detections include: Total Trihalomethanes (49.2668 ug/L, EPA limit: 80 ug/L — 62% of limit); Copper (0.7465 mg/L, EPA limit: 1.3 mg/L — 57% of limit); Haloacetic Acids (32.5542 ug/L, EPA limit: 60 ug/L — 54% of limit); Lead (0.0074 mg/L, EPA limit: 0.015 mg/L — 49% of limit); Mercury (0.001 mg/L, EPA limit: 0.002 mg/L — 48% of limit). The water system also has 1 active EPA violation(s). Water quality can vary seasonally and by neighborhood, so home testing provides the most accurate picture for your specific tap.
Yes, we recommend filtering your water in Mount Prospect. With a score of 68/100 and 3 contaminant(s) at elevated levels, a certified water filter adds a meaningful layer of protection. A faucet-mounted or pitcher filter with NSF/ANSI 53 certification is a good starting point. For more thorough contaminant removal, consider an under-sink reverse osmosis system, especially if you have specific concerns about Total Trihalomethanes.
Mount Prospect's water quality score of 68/100 (C+) is 4 points below the national average of 72. The city's water comes from surface water sources like rivers and reservoirs. While the water meets minimum federal standards, there is room for improvement compared to top-performing cities. You can see how Mount Prospect compares to nearby cities in our state rankings.
Detailed contaminant data, violation history, and water system information for Mount Prospect.
Find the best water filter for Mount Prospect based on detected contaminants and your budget.
See how Mount Prospect compares to other cities across Illinois.
See how Mount Prospect ranks among all cities in the US for water quality.
Data Disclaimer
This report is based on publicly available EPA data and water quality test results. Water quality can vary by neighborhood, building age, and season. This information is for educational purposes and should not replace professional water testing. If you have specific health concerns about your water, contact your local water utility or a certified water testing laboratory. Last data update: February 2, 2026.