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Fall Salt-Pollution Stream Snapshot

October 15 – October 18 EDT

A map showing Valley Forge Trout Unlimited's fall salt snapshot sampling sites.
A map showing Valley Forge Trout Unlimited’s 2025 Fall Salt Snapshot sampling sites.

Want to Get Involved in Community Science?

Subscribe to E-News to be notified of upcoming salt snapshots.

Amber Stilwell, PA Sea Grant Coastal Outreach Specialist and Northwest PA Master Watershed Steward Coordinator tests samples for chloride and conductivity levels.
Amber Stilwell, PA Sea Grant Coastal Outreach Specialist and Northwest PA Master Watershed Steward Coordinator, tests 2025 Fall Salt Pollution Snapshot samples for chloride and conductivity levels. Photo courtesy of PA Sea Grant

A salt-pollution snapshot provides a unique, hands-on opportunity to generate data illustrating that road salt contaminates our watersheds year-round. This data will help start local conversations and shine a public spotlight on this critical water quality issue. The level of road salt contamination highly depends on how much road salt private applicators and municipalities use and how they handle it. Local data are vital to the conversation.  

Get Involved

The target sampling date is Thursday, October 15, and the priority date range is Thursday, October 15 through Sunday, October 18, weather permitting.

Collect all samples during baseflow conditions, when water levels are stable and not influenced by storm runoff. All participants should use 1- to 10-day forecasts to ensure they collect baseflow samples (baseflow = a stream’s resting state, fed mostly by groundwater rather than storm runoff). For a baseflow sample, no significant rain (~0.25 inches or more) should fall in the 48 hours before sample collection. Significant rainfall will require sampling outside the target October 15–18 range. 

(If you’re working as a group, please have your leader register.)

(Request chloride test strips and conductivity meters after you’ve figured out what you’ll need.)

(For sample drop-off, to encourage participation, and to share on social media).

Instructions and Resources

Screenshot of the 2025 Winter Salt Stream Snapshot map, showing levels of road salt contamination in streams.

Use the technical guidance, online data sheet, and online map throughout your site selection, planning, sampling, and analysis process.

Questions? Please contact Community Science Facilitator David Bressler at dbressler@stroudcenter.org.

Public Participation

The organizations listed below will accept water samples from the general public for analysis and posting to the Salt Pollution Snapshot Data Map.

OrganizationSamples AcceptedLocationAdditional Information
Brandywine Red Clay AllianceOctober 15 from 10 a.m. to 1 p.m. (Rain date: October 16)1760 Unionville-Wawaset Road, West Chester, PA 19382Registration form
Chester/Delaware County Master Watershed Stewards and Stroud Water Research CenterOctober 15 from 11 a.m. to 3 p.m.West Chester Borough Hall, 401 E. Gay Street, West Chester, PA 19380j_debes@msn.com
Patagonia Main LineOctober 15–17 from 11 a.m. to 7 p.m. and October 18 from 11 a.m. to 6 p.m.61 Anderson Avenue, Ardmore, PA 19003Instructions
Foodshed AllianceOctober 15 and 16, 10 a.m. to 2 p.m. each day.Memory Park, Newton, NJ 07860Registration form
Montgomery County Master Watershed StewardsOctober 16 from 3 to 6:30 p.m.1015 Bridge Road, Collegeville, PA 19426frankgen6@gmail.com
Bucks County Master Watershed StewardsOctober 17 from 1 to 4 p.m.576 Penns Park Road, Newtown, PA 18940jwalter881@verizon.net
Pennypack Ecological Restoration Trust (PERT)October 17 from 11 a.m. to 1 p.m.BLBB classroom, rear/lower level of PERT’s main office, 2955 Edge Hill Road, Huntingdon Valley, PAkroth@pennypacktrust.org OR ryan@ttfwatershed.org
Delaware Master NaturalistsOctober 18 from 9 a.m. to 12 p.m.
Brown Horticulture Learning Center at Winterthur Museum, Garden & Library, 5105 Kennett Pike, Winterthur, DE 19735Registration form
Stroud Water Research Center and Chesapeake Bay FoundationOctober 19 from 11 a.m. to 3 p.m.The Rotunda at the Pennsylvania State Capitol Complex, Harrisburg, PA 17120Instructions
Free