# Three river pollution incidents in eight days in Ille-et-Vilaine

> On November 4, 2026, pollution was discovered in the La Valière stream near Vitré, with investigators from the OFB tracing the source of the discharge back to Mayenne. On November 6, a new water pollution was found in the Vitré area, with the Cantache river affected after an agricultural discharge. On November 10, three pollutions in eight days were recorded in Ille-et-Vilaine, affecting La Valière, the Cantache and the Yaigne. These incidents sparked anger among fishermen and raised questions about monitoring of agricultural and industrial discharges.

**In brief**: Ongoing story bringing together 3 events in 2 departments (Ille-et-Vilaine, Mayenne), followed from 4 November 2026 to 10 November 2026. 3 articles from 3 sources (environment); last updated on 10 November 2026 at 05:49.

- Status: ongoing
- Category: Environment
- Place: Ille-et-Vilaine, Mayenne
- First detected: 4 November 2026 at 09:50
- Updated: 10 November 2026 at 05:49
- Web page: https://acturadar.com/en/stories/497-three-river-pollution-incidents-in-eight-days-in-ille-et-vilaine

## Timeline (3 events)

### 4 November 2026 — [Pollution of La Valière stream between Mayenne and Ille-et-Vilaine](https://acturadar.com/en/events/9056-pollution-of-la-valiere-stream-between-mayenne-and-ille-et-vilaine.md)

Pollution has been discovered in La Valière stream, near Vitré. Investigators from the OFB traced the source of the discharge back to Mayenne.

1 sources, 1 articles · ruisseau de La Valière — Mayenne, Ille-et-Vilaine

### 6 November 2026 — [Vitré area: new water pollution after agricultural spill in the Cantache river](https://acturadar.com/en/events/11621-vitre-area-new-water-pollution-after-agricultural-spill-in-the-cantache-river.md)

New water pollution was detected in the Vitré area (Ille-et-Vilaine), with the Cantache river affected this Friday, November 6, 2026, following an agricultural spill.

1 sources, 1 articles · Pays de Vitré — Ille-et-Vilaine

### 10 November 2026 — [Three watercourse pollution incidents in eight days in Ille-et-Vilaine](https://acturadar.com/en/events/14774-three-watercourse-pollution-incidents-in-eight-days-in-ille-et-vilaine.md)

The Valière, the Cantache and the Yaigne have been affected by three pollution incidents in eight days, provoking anger among fishermen and raising questions about monitoring of agricultural and industrial discharges.

1 sources, 1 articles · Ille-et-Vilaine

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Cite as: Acturadar, “Three river pollution incidents in eight days in Ille-et-Vilaine”, https://acturadar.com/en/stories/497-three-river-pollution-incidents-in-eight-days-in-ille-et-vilaine
Methodology: https://acturadar.com/en/methodology