Water Quality Information

Caring for Aquatic Resources

Protecting natural and cultural resources; encouraging recreation while promoting conservation; and providing clean, safe, and accessible places for park visitors and neighbors are core to Montgomery Parks’ mission. Montgomery Parks routinely works to prevent stormwater and other types of pollution from impacting our aquatic resources and actively responds to potential water quality concerns.

Managing Water Quality on Parkland

Aquatic resources are sensitive to changes from the surrounding land. Biological monitoring allows for the long-term evaluation of stream conditions and a cumulative assessment of overall watershed health, but there are occasionally discrete, more localized conditions that may attract attention and that may have the potential to affect ecological health and public safety alike.

Iron-Oxidizing Bacteria

The appearance of an orange substance in the water can be a sign that iron-oxidizing bacteria are present. Iron-oxidizing bacteria use dissolved iron in the environment for energy and produce orange or rust-colored byproducts that can appear as fuzzy-looking flocculant, sludge, or surface film. Although the orange appearance can be unsightly, the bacteria that create it are naturally occurring and are a harmless part of our local aquatic ecosystem. Signs of iron-oxidizing bacteria are often found in slow or still-moving water, as well as stormwater outfalls and road culverts, but do not pose a threat to human, pet, or ecosystem health. Iron-oxidizing bacteria can also produce an oily-looking sheen on the surface of the water, which can sometimes be confused for petroleum pollution, but can be readily distinguished in the field using a stick or rock.

Blue-green Algae (Cyanobacteria) and Microcystin

Blue-green algae are cyanobacteria capable of producing microcystin toxins that are harmful to people and pets that come into contact with affected standing water. Blooms associated with elevated levels of toxic microcystins have been frequently observed in Lake Frank and Lake Needwood in Rock Creek Regional Park in late summer/early fall. Staff routinely inspect and monitor conditions, and signs are posted and media advisories are circulated if potentially harmful levels are detected.

Wetlands and Mosquitos

From large lakes, ponds, and marshes, to streamside swamps and tiny, transient vernal pools, the wetlands in our parks play a vital role in the environment. Much like the kidneys in our own bodies, wetlands filter impurities in our watersheds. They also act as natural flooding and stormwater pollution control and represent some of the most prolific wildlife habitats, connecting terrestrial and aquatic ecosystems. Although wetlands are marked by standing water, they rarely are the source of common complaints about mosquitoes.

Amphibians as Indicators

One way park patrons can learn more about wetlands and their inhabitants is by becoming a Montgomery FrogWatch Chapter Volunteer! Montgomery Parks and the Montgomery County Department of Environmental Protection cohost the local chapter of FrogWatch USA, provide training, and support volunteers with guidance on wetland site selection and data collection. Volunteers receive training to recognize and record data on the unique breeding vocalizations of frogs and toads heard after dusk at wetlands and submit them to the national FrogWatch USA database. An interactive map is available for locating inventoried wetlands and viewing where volunteer listening locations have been established to date. A data summary is available in the 2021 Montgomery County FrogWatch Results in Montgomery Parks interactive report.

Training for new volunteers is offered annually and typically scheduled in late winter. Training opportunities for the 2022 data collection season (February – August) are being planned; recordings and materials from previous trainings are already hosted on the Montgomery County FrogWatch Chapter page. Inquiries may be directed to frogwatch@montgomeryparks.org.

Aquatic Nuisance Species

Aquatic nuisance species are animals and plants that have been introduced into a waterbody, become established, and cause harm by impacting the local environment, economy, and/or human health. Several species identified in Maryland have or are at risk of invading our parks, but patrons can play a part in preventing their spread by taking simple steps like managing fishing bait and boating gear properly.

Reporting a Water Quality Concern

Patrons are the eyes and ears in our Parks, and we welcome your help in protecting aquatic resources. Contact Montgomery Parks via the Pollution Incident Phone Line: (301) 495-3582, or the Public Information & Customer Service Office, if you see something unusual in one of our bodies of water, including algal blooms, fish kills, and sediment pollution. For sewage leaks and water main break concerns, contact WSSC Emergency Services directly.

Last Updated: December 1, 2021