The Danbury Water Department says their system recently violated a drinking water standard. Although this was not considered an emergency, the department is alerting customers to the incident. The City monitors water for turbidity or cloudiness to determine whether the water supply is being filtered effectively. Water samples in July showed that just under 6-percent of measurements exceeded turbidity units. The standard is no more than 5-percent of samples per month. The algal bloom causing the turbidity problem was treated. The water quality in the reservoir improved within a few days resulting in a return to normal turbidity levels. The Danbury Water Department says there is no corrective action needed by customers such as boiling water. Turbidity may indicate the presence of disease-causing organisms including bacteria, viruses, and parasites that can cause symptoms such as nausea, cramps, diarrhea and associated headaches. People with severely compromised immune systems, infants, and some elderly may be at increased risk of these health effects.