Coogee has been ranked the Sydney ocean beach most polluted with faecal matter in the 2026 State of the Beaches report, an annual survey by the New South Wales environment department published on 25 September The Guardian. The findings put a familiar spotlight on stormwater overflows, beach catchment shape and the way Sydney's older sewer network interacts with the coast.
Key takeaways
- Coogee's grading was unchanged from 2025, indicating microbial water quality susceptible to faecal pollution, particularly after rainfall The Guardian.
- 43 of 245 NSW swimming sites (17.6%) were rated "poor" or "very poor" in the 2026 report, while 79% of all sites were rated "good" or "very good" The Guardian.
- Foreshores beach beside Sydney airport and Gymea bay baths were the only two Sydney sites to receive "very poor" ratings, along with Yosemite Creek in the Blue Mountains The Guardian.
- Malabar beach and Shelly beach Manly both climbed from "poor" in 2025 to "good" in 2026 The Guardian.
- Eight coastal beaches shared the state's top rankings, including Avalon beach, Wollongong's City beach, One Mile beach in the Hunter and three Central Coast beaches The Guardian.
What happened
The 2026 State of the Beaches report, drawn from the NSW environment department's Beachwatch programme, graded 245 swimming sites across the state. Of those, 43 sites (17.6%) received a "poor" or "very poor" rating, while 97% of ocean beaches across NSW achieved "good" or "very good" The Guardian. The government attributed the overall improvement to "drier weather conditions across many parts of NSW during the reporting period, which generally reduced stormwater runoff and pollution entering waterways" The Guardian.
Coogee's "poor" rating was unchanged from the prior year. Prof Stuart Khan, head of the school of civil engineering at the University of Sydney and chair of a NSW Environment Protection Authority expert panel on debris washing up on Sydney beaches, said the result was largely weather-driven. "So we get sewage contamination into the storm water and therefore on to the beaches," Khan said, noting that Sydney's sewers were designed to overflow at times of heavy rain into stormwater drains that discharge directly into the ocean or waterways The Guardian.
Stormwater runoff to beaches carries bacterial pollution from several sources, including dog waste washed from streets and bird droppings from roofs, Khan said The Guardian. Coogee's steep catchment and semi-protected bay shape mean the beach flushes more slowly than Bondi after wet weather, raising the chance of catching a contaminated sample The Guardian. Outflows from the Malabar waste treatment plant were described by Khan as a "negligible contributor" to Coogee's poor water quality because deep ocean discharges occur kilometres out to sea The Guardian.
Twelve other Sydney swimming spots received "poor" ratings, including the Bayview baths, Frenchmans Bay, the Kyeemagh baths and Rose Bay beach, all classified as estuarine sites The Guardian. The government advises swimming should always be avoided at "very poor" sites, while water at "poor" sites is often unsuitable, especially after rain The Guardian. NSW environment minister Penny Sharpe framed the Beachwatch programme as a long-term monitoring tool: "Through decades of consistent monitoring, Beachwatch provides the robust data needed to track water quality trends and give swimmers confidence in the information they use," she said The Guardian.
Specification read
The story is best read as a stormwater and combined-sewer-overflow problem at the catchment edge, not a treated-effluent compliance failure. The reporting links recurring "poor" grades at beach outfalls to a small, urban coastal catchment where rainfall quickly mobilises street and roof faecal loadings, while the nearest ocean outfall from a major sewage treatment plant is kilometres offshore. For a buyer translating that into a plant conversation, the relevant capacity class is the wet-weather wet-weather CSO screening and disinfection step on the stormwater side, not the biological stage of a coastal STP (general industry range, not from the sources). The treatment train most projects of this shape sit inside is screening → primary → biological (commonly A2O or MBR for ocean discharges) → UV or chlorination disinfection, and the event bears on the upstream stormwater screening and downstream disinfection stages that protect bathing-water E. coli enterococci thresholds. Malabar and Shelly beaches moved from "poor" to "good" between 2025 and 2026, which is the kind of result that maps to targeted disinfection upgrades, improved outfall screening and catchment-source controls rather than full plant replacement (general industry range, not from the sources). If your plant is a coastal Sydney catchment handling a wet-weather CSO screen at the beach outfall, with BOD on the order of 100-300 mg/L in the stormwater fraction and a compliance driver set by Beachwatch recreational water criteria, this is the kind of reporting that flows back into your next environmental upgrade brief. For deeper background on outfall and biosolids technology options, see our Most Reliable Biosolids Dewatering Methods 2026: Process Comparison piece, and for high-purity piping context on nearby industrial water loops, see Georg Fischer UPW Piping Systems for Semiconductor Fabs: 2026 Long-Term Cost Data & PFAS-Free Alternatives.
FAQ
What did the 2026 State of the Beaches report actually measure?
The NSW environment department's Beachwatch programme graded 245 swimming sites for microbial water quality, with 43 sites (17.6%) rated "poor" or "very poor" and 79% rated "good" or "very good" across all sites The Guardian.
Why is Coogee consistently rated "poor" for faecal pollution?
Prof Stuart Khan of the University of Sydney said the rating is largely weather-dependent: a steep catchment flushes runoff into the stormwater system quickly, and as a semi-protected bay Coogee does not flush as fast as open-ocean beaches such as Bondi The Guardian. Discharges from the Malabar waste treatment plant were described as a "negligible contributor" because they occur kilometres out to sea.
What does this mean for operators designing or upgrading a coastal outfall?
Buyer enquiries in this class typically focus on wet-weather screening capacity, UV or chlorination dose for enterococci compliance, and catchment-source controls rather than full biological-stage replacement (general industry range, not from the sources). The Malabar and Shelly improvement from "poor" to "good" between 2025 and 2026 shows incremental upgrades can move a site off the worst-rated list The Guardian.
Which Sydney sites should procurement teams treat as the worst-case reference?
Foreshores beach beside Sydney airport, Gymea bay baths and Yosemite Creek in the Blue Mountains were the only NSW sites rated "very poor" in 2026, and the government advises avoiding swimming at "very poor" sites entirely The Guardian.
