Tod Creek watershed: Water quality report for the 2025 dry season

Executive summary

Water is essential for life, and steps are needed to understand, protect and restore its health in fish habitat throughout British Columbia. The Raincoast Healthy Waters program was launched in 2023 to establish community-oriented water pollution monitoring in select BC watersheds. Two Healthy Waters sampling events take place every year in each watershed: the dry season (summer), and the wet season (winter). This report highlights results from one sampling event: the second dry (summer) season sampling, carried out with the support and participation of the Capital Regional District (CRD) and Tsartlip First Nation. 

Briefly, the Healthy Waters team sampled the Tod Creek watershed on July 31st, 2025. The team worked with CRD, Tsartlip First Nation and community volunteers to first determine basic water properties (temperature, conductivity, pH, dissolved oxygen and turbidity) in situ. Water samples were collected from six water categories, including source water (3 samples), stream and river water (3 samples), road runoff (3 samples), tap water (10 samples – 9 from the Sooke supply and 1 from groundwater were pooled into a single composite sample), and marine water (3 samples), alongside surface water samples collected in the areas surrounding the Hartland landfill (1 sample). The samples were pooled into composites by category and then analysed for coliform, nutrients (6), physical parameters, metals (37), pesticides (62), polycyclic aromatic hydrocarbons (PAHs; 76), pharmaceuticals and personal care products (PPCPs; 141), polychlorinated biphenyls (PCBs; 209), alkylphenol ethoxylates (APEs; 4), bisphenols (BPs; 6), per- and poly-fluoroalkyl substances (PFAS; 40), sucralose and 6PPD-Quinone.

We detected 176 contaminants out of 577 measured in the stream and river category – i.e. fish habitat – for the Tod Creek watershed, excluding nutrients, fecal coliform and physical parameters. This dry season sampling with a limited number of samples suggests that, overall, Tod Creek water quality was poor to fair. Tod Creek proper suffered from low dissolved oxygen, high temperatures and a number of detected contaminants during the summer months. Additional sampling and analysis planned will provide additional insight into any sources or activities that may be impacting the health of this valued watershed.

Tod Creek watershed

Key findings

• This assessment of water quality in Tod Creek reflects the fourth of four site visits, and the second dry season sampling. Our understanding of water quality in the Tod Creek watershed is growing as we complete this final sampling, and pursue a deeper exploration of the entire dataset from four seasonal samplings, and evaluate against other watersheds.
• Our study design was not designed to explicitly address the performance of Hartland Landfill, but rather to provide an integrated ‘snapshot’ of water quality in six categories of water in the Tod Creek watershed, including source, stream & river, road runoff, tap, marine and Hartland drainage.
• The Hartland drainage water sample had the highest dry season concentrations of E. coli and PFAS. 
• The road runoff sample had the highest concentration of nitrate, sucralose and 6PPDq in the dry season. 
• Stream and river water had the highest concentration of pesticides and bisphenols.
• Further sampling and analysis may provide insight into the extent to which local agriculture and septic systems may be impacting water quality in Tod Creek.
• The pooled tap water sample had the highest concentrations of PAHs, PCBs and APEs; there was only WQG available for one PAHs and it was not exceeded.
• Marine water had the highest concentrations of metals and PPCPs in the dry season. 
• Source water had the lowest contaminant concentrations.
• Overall, the Tod Creek watershed had poor to fair water quality in the dry season:
• There were 15 exceedances of Canadian Environmental Quality Guidelines for the protection of aquatic life.
  • Exceedances included:
    • Low dissolved oxygen and high temperature and iron in the source sample;
    • Low dissolved oxygen and high iron and phosphate in the stream and river sample;
    • Low dissolved oxygen and high aluminum, copper and iron in the road runoff sample;
    • High boron in the marine sample;
    • Low dissolved oxygen and aluminum, copper and iron in the Hartland sample.
  • There were 0 exceedances of Health Canada Drinking Water Quality Guidelines.

Background

Raincoast’s Healthy Waters Program (https://www.raincoast.org/waters/) delivers high-resolution, community-oriented water quality analysis to watersheds across southern British Columbia. The goal of Healthy Waters is to empower communities with the understanding of the status of water quality in their watersheds, to allow for local advocacy regarding both point and nonpoint source pollution. 

The Capital Regional District (CRD) serves approximately 440,000 people from 13 municipalities and three electoral areas on southern Vancouver Island and the Gulf Islands.  The traditional territories of many First Nations span portions of the region and 11 of those Nations hold reserve lands throughout the capital region.  

Community and Indigenous concerns expressed about possible threats to water quality in Tod Creek sparked interest in this project, but Tod Creek is at the receiving end of numerous activities and potential contaminant sources. Of note is that local agriculture, the Heals Rifle Range as a federal contaminated site, domestic septic fields, the Hartland Landfill operation,  and other sectors also are likely to influence water quality in Tod Creek. Findings from this and future sampling events will provide insight into the potential for each of these sectors to explain any degradation of water quality – an important element of protection and restoration.

Tsartlip First Nation is one of two current members of the W̱SÁNEĆ Leadership Council (WLC); the second is Tseycum First Nation. The Tsartlip reserve is situated in Brentwood Bay, BC.  The WLC was formed to create a unified entity responsible for representing the common interests of the W̱SÁNEĆ Nations. The W̱SÁNEĆ Peoples have been responsible for stewardship of the land since time immemorial.

A watershed based approach to sampling

We collect samples from five different categories of water in each of our partner watersheds: from source water, upstream of human impacts, down to the marine environment. 

Source water serves as an upstream reference sample, allowing us to determine which contaminants are being introduced as water traces its path down through the watershed. 

Stream and river samples allow us to investigate the quality of fish habitat directly, by collecting samples from streams, creeks, and rivers used by salmon and other fish species (either currently or historically). 

Road runoff serves as an impacted sample category of current concern, as many contaminants, including  PAHs, metals, surfactants and chemicals such as 6-PPD quinone can be washed off roadways and into fish habitat during rain events. 

We include tap water samples in our analysis as a way to bring our homes into the conversation – we borrow water from the environment in the form of municipal or well water, and generally return it to aquatic habitats in a more-degraded state in the form of storm and sewage effluent (treated or untreated).

Marine water samples provide insight into those contaminants that may degrade fish and whale habitat in the ocean, and enable an understanding of the contribution of land-based pollutants from the adjacent watershed to the marine environment.

Collectively, the lessons learned from our partnering watersheds will contribute to a greater understanding of threats to water quality across British Columbia, and ultimately what policy changes can be implemented to preserve the quality of water for the future of salmon, whales, and people.