Marazion water quality

RED

designated bathing water · · South West Water

Marazion is a designated bathing water in Cornwall, currently rated RED for swimming — Storm overflow discharging within 5 km right now. Incoming/high tide may carry discharge closer to shore. Its latest Environment Agency classification is excellent (2025), and 337 storm-overflow spills were recorded nearby in 2025. Below: live risk, recent spills, official samples, rainfall, tides and nearby reports.

Safe to swim right now?
Avoid — pollution risk
Storm overflow discharging within 5 km right now. Incoming/high tide may carry discharge closer to shore.
Do not rely solely on this website for health decisions. Check official alerts and use your own judgement. Seek medical advice if you are unwell.

Current status

Risk: RED Storm overflow discharging within 5 km right now. Incoming/high tide may carry discharge closer to shore.

  • Active overflows nearby: 4
  • Recent overflows (48h): 21
  • Rainfall (48h): 34.5 mm

Official EA classification

excellent (2025)

Latest official sample

2026-09-18 — E.coli 18, enterococci 10 cfu/100ml

Latest independent sample

None published

Pollution & environment data

34.5 mm
Rainfall 48h
71.4 mm
Rainfall 7d
10
Outfalls within 5 km
337
Spills (2025, official)
100
Spills 2026 so far (live)
52
Spills last 30d
high 1.86m
Tide now

Recent storm overflows nearby (30 days)

In the news nearby

No recent local news matched.

Storm-overflow spills near here, by year (EDM)

Recent spills near here (precise, SWW)

Full spill history near Marazion

Download CSV

Every storm-overflow discharge Glanmor has recorded within 5 km of Marazion, newest first.

101 discharge events
StartEndOutfallDistance
2026-10-24 14:46ongoingLONGROCK STREAM~1.5 km
2026-10-24 14:05ongoingLONGROCK STREAM~1.5 km
2026-10-24 11:452026-10-24 12:45LOCAL STREAM (S)~3.2 km
2026-10-24 11:102026-10-24 12:23LOCAL STREAM (S)~3.2 km
2026-10-24 10:332026-10-24 11:00LOCAL STREAM (S)~3.2 km
2026-10-24 10:15ongoingSURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-10-24 10:042026-10-24 13:46(C) MOUNTS BAY~2.9 km
2026-10-24 09:57ongoingSURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-10-24 09:302026-10-24 13:30(C) MOUNTS BAY~2.9 km
2026-10-24 08:452026-10-24 09:45SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-10-23 03:522026-10-23 04:03(C) MOUNTS BAY~2.9 km
2026-10-23 02:512026-10-23 04:10SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-10-23 02:152026-10-23 05:00SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-10-22 23:262026-10-22 23:36SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-10-22 23:152026-10-23 00:15SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-10-22 23:002026-10-23 09:31MOUNTS BAY (C)~1.5 km
2026-10-22 22:342026-10-23 09:16MOUNTS BAY (C)~1.5 km
2026-10-22 19:462026-10-22 20:16LOCAL STREAM (S)~3.2 km
2026-10-22 19:332026-10-22 19:44(C) MOUNTS BAY~2.9 km
2026-10-22 19:232026-10-22 20:07SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-10-22 19:212026-10-22 19:34LOCAL STREAM (S)~3.2 km
2026-10-22 19:142026-10-22 19:24LOCAL STREAM (S)~3.4 km
2026-10-22 18:262026-10-22 21:01SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-10-22 18:022026-10-22 20:46SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-10-22 17:262026-10-22 18:16LOCAL STREAM (S)~3.4 km
2026-10-22 00:452026-10-22 01:15SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-10-22 00:082026-10-22 00:36SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-10-21 21:552026-10-21 22:05(C) MOUNTS BAY~2.9 km
2026-10-21 21:452026-10-21 22:30SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-10-21 21:122026-10-21 21:44SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-10-20 23:452026-10-21 00:30SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-10-20 23:202026-10-20 23:58SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-10-20 22:132026-10-20 22:16LOCAL STREAM (S)~3.2 km
2026-10-20 22:002026-10-20 22:02LOCAL STREAM (S)~3.4 km
2026-10-20 21:152026-10-20 22:45SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-10-15 19:462026-10-15 20:45SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-10-15 19:302026-10-15 20:28SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-10-11 22:152026-10-11 22:45SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-10-11 21:462026-10-11 22:09SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-10-11 20:452026-10-11 21:45SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-10-11 19:332026-10-11 19:52SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-10-11 18:452026-10-11 19:45SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-10-11 16:152026-10-11 18:30SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-10-11 15:542026-10-11 18:15SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-10-11 13:112026-10-11 13:20SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-10-09 13:162026-10-09 13:46SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-10-09 13:022026-10-09 13:13SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-09-30 01:002026-09-30 01:15SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-09-30 00:042026-09-30 00:35SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-09-29 19:342026-09-29 19:37LOCAL STREAM (S)~3.4 km
2026-09-29 19:152026-09-29 21:30SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-09-22 10:072026-09-22 10:08RED RIVER~2.2 km
2026-09-17 06:032026-09-17 06:07SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-09-10 19:272026-09-10 19:40SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-09-08 06:482026-09-08 07:07SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-09-08 05:002026-09-08 05:26LOCAL STREAM (S)~3.2 km
2026-09-08 04:562026-09-08 05:08LOCAL STREAM (S)~3.4 km
2026-09-08 03:142026-09-08 06:26(C) MOUNTS BAY~2.9 km
2026-09-08 02:152026-09-09 00:00SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-09-08 00:002026-09-08 00:15SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-09-04 00:132026-09-04 00:16LOCAL STREAM (S)~3.2 km
2026-08-30 18:452026-08-30 19:45SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-08-30 18:302026-08-30 19:30SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-08-29 09:002026-08-29 10:15SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-08-29 08:482026-08-29 09:23(C) MOUNTS BAY~2.9 km
2026-08-29 08:282026-08-29 08:36SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-08-29 03:462026-08-29 03:49LOCAL STREAM (S)~3.4 km
2026-08-29 02:452026-08-29 04:30(C) MOUNTS BAY~2.9 km
2026-08-29 02:302026-08-29 04:30LOCAL STREAM (S)~3.2 km
2026-08-29 02:292026-08-29 02:53LOCAL STREAM (S)~3.2 km
2026-08-29 01:452026-08-29 04:45SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-08-27 11:242026-08-27 11:27LOCAL STREAM (S)~3.4 km
2026-08-27 02:462026-08-27 02:58SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-08-27 02:002026-08-27 02:15SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-08-27 00:002026-08-27 00:15SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-08-25 14:242026-08-25 14:27SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-08-21 08:452026-08-21 09:15SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-08-21 08:312026-08-21 08:52SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-08-19 04:302026-08-19 05:15SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-08-19 04:022026-08-19 04:40SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-08-19 02:152026-08-19 03:15SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-08-19 01:552026-08-19 02:21SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-08-13 07:47ongoingLONGROCK STREAM~1.5 km
2026-08-11 14:152026-08-11 14:45LUDGVAN STREAM~2.1 km
2026-08-11 14:052026-08-11 14:06LUDGVAN STREAM~2.1 km
2026-08-05 11:342026-08-05 11:35LOCAL STREAM (S)~3.4 km
2026-07-22 20:072026-07-22 20:09MOUNTS BAY (C)~1.5 km
2026-07-13 09:562026-07-13 09:59SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-07-12 15:522026-07-12 15:53LUDGVAN STREAM~2.1 km
2026-07-09 02:452026-07-09 06:30MOUNTS BAY (C)~1.5 km
2026-07-09 01:552026-07-09 02:01MOUNTS BAY (C)~1.5 km
2026-06-16 19:122026-06-16 19:21SURFACE WATER DRAIN TO CHYANDR~5.0 km
2026-06-13 00:062026-06-15 07:12MOUNTS BAY (C)~1.5 km
2026-06-08 04:232026-06-08 04:43(C) MOUNTS BAY~2.9 km
2026-06-08 03:522026-06-08 04:03LOCAL STREAM (S)~3.2 km
2026-06-08 03:442026-06-08 03:52LOCAL STREAM (S)~3.4 km
2026-05-28 08:462026-05-28 08:49LUDGVAN STREAM~2.1 km
2026-04-27 10:572026-04-27 11:03LONGROCK STREAM~1.5 km
2026-01-29 17:002026-01-29 17:19STREAM (S)~2.8 km
2026-01-20 13:052026-01-20 13:09RED RIVER~2.2 km
2025-09-09 15:582025-09-09 16:47MOUNTS BAY~3.6 km
88 precise spill records (duration & volume)
WhenDetailDistance
2026-10-24 14:05spill, 24 min~1.5 km
2026-10-24 11:10spill, 74 min~3.2 km
2026-10-24 10:33spill, 27 min~3.2 km
2026-10-24 10:04spill, 189 min~2.9 km
2026-10-24 09:57spill, 272 min~5.0 km
2026-10-24 09:06spill, 38 min~2.9 km
2026-10-24 08:29spill, 62 min~5.0 km
2026-10-23 03:52spill, 10 min~2.9 km
2026-10-23 02:51spill, 79 min~5.0 km
2026-10-23 01:53spill, 7 min~5.0 km
2026-10-22 23:26spill, 10 min~5.0 km
2026-10-22 22:46spill, 14 min~5.0 km
2026-10-22 22:34spill, 603 min~1.5 km
2026-10-22 19:33spill, 11 min~2.9 km
2026-10-22 19:23spill, 44 min~5.0 km
2026-10-22 19:21spill, 13 min~3.2 km
2026-10-22 19:14spill, 10 min~3.4 km
2026-10-22 18:26spill, 34 min~5.0 km
2026-10-22 17:26spill, 8 min~3.4 km
2026-10-22 17:13spill, 47 min~5.0 km
2026-10-22 00:08spill, 28 min~5.0 km
2026-10-21 21:55spill, 10 min~2.9 km
2026-10-21 21:12spill, 33 min~5.0 km
2026-10-20 23:20spill, 38 min~5.0 km
2026-10-20 22:13spill, 3 min~3.2 km
2026-10-20 22:00spill, 2 min~3.4 km
2026-10-20 20:45spill, 44 min~5.0 km
2026-10-15 19:30spill, 58 min~5.0 km
2026-10-11 21:46spill, 23 min~5.0 km
2026-10-11 20:18spill, 63 min~5.0 km
2026-10-11 18:27spill, 60 min~5.0 km
2026-10-11 17:32spill, 25 min~5.0 km
2026-10-11 15:54spill, 65 min~5.0 km
2026-10-11 13:11spill, 9 min~5.0 km
2026-10-09 13:02spill, 11 min~5.0 km
2026-09-30 00:04spill, 32 min~5.0 km
2026-09-29 22:07spill, 17 min~5.0 km
2026-09-29 19:34spill, 3 min~3.4 km
2026-09-22 10:07spill, 1 min~2.2 km
2026-09-17 06:03spill, 5 min~5.0 km
2026-09-10 19:27spill, 13 min~5.0 km
2026-09-08 06:48spill, 19 min~5.0 km
2026-09-08 05:00spill, 25 min~3.2 km
2026-09-08 04:56spill, 12 min~3.4 km
2026-09-08 03:14spill, 192 min~2.9 km
2026-09-08 01:52spill, 7 min~5.0 km
2026-09-07 23:05spill, 40 min~5.0 km
2026-09-04 00:13spill, 3 min~3.2 km
2026-08-30 18:30spill, 9 min~5.0 km
2026-08-29 08:48spill, 35 min~2.9 km
2026-08-29 08:28spill, 7 min~5.0 km
2026-08-29 03:46spill, 3 min~3.4 km
2026-08-29 02:29spill, 23 min~3.2 km
2026-08-27 11:24spill, 3 min~3.4 km
2026-08-27 02:46spill, 12 min~5.0 km
2026-08-27 02:09spill, 22 min~5.0 km
2026-08-27 01:13spill, 30 min~5.0 km
2026-08-25 14:24spill, 2 min~5.0 km
2026-08-21 08:31spill, 21 min~5.0 km
2026-08-19 04:02spill, 39 min~5.0 km
2026-08-19 01:55spill, 26 min~5.0 km
2026-08-13 07:47spill, 1489 min~1.5 km
2026-08-11 14:05spill, 2 min~2.1 km
2026-08-05 11:34spill, 1 min~3.4 km
2026-07-22 20:07spill, 2 min~1.5 km
2026-07-13 09:56spill, 2 min~5.0 km
2026-07-12 15:52spill, 1 min~2.1 km
2026-07-09 01:55spill, 5 min~1.5 km
2026-06-16 19:12spill, 10 min~5.0 km
2026-06-16 19:12spill, 10 min~5.0 km
2026-06-13 00:06spill, 3306 min~1.5 km
2026-06-13 00:06spill, 3306 min~1.5 km
2026-06-08 04:23spill, 20 min~2.9 km
2026-06-08 04:23spill, 20 min~2.9 km
2026-06-08 03:52spill, 11 min~3.2 km
2026-06-08 03:52spill, 11 min~3.2 km
2026-06-08 03:44spill, 8 min~3.4 km
2026-06-08 03:44spill, 8 min~3.4 km
2026-05-28 08:46spill, 3 min~2.1 km
2026-05-28 08:46spill, 3 min~2.1 km
2026-04-27 10:57spill, 6 min~1.5 km
2026-04-27 10:57spill, 6 min~1.5 km
2026-01-29 17:00spill, 20 min~2.8 km
2026-01-29 17:00spill, 20 min~2.8 km
2026-01-20 13:05spill, 4 min~2.2 km
2026-01-20 13:05spill, 4 min~2.2 km
2025-09-09 15:58spill, 49 min~3.6 km
2025-09-09 15:58spill, 49 min~3.6 km
Take action — email SWW / your MPGot ill here? Build a reportReport pollution

Water quality — 7-year trend

Water quality improved in 2026: average E. coli was 20% lower than 2025.

YearEA classificationSamplesE. coli (geo-mean)Enterococci (geo-mean)High readings
2019—1213 cfu/100ml13 cfu/100ml0
2020—3217 cfu/100ml88 cfu/100ml1 of 3
2021—2019 cfu/100ml28 cfu/100ml3 of 20
2022—2016 cfu/100ml24 cfu/100ml1 of 20
2023—2019 cfu/100ml19 cfu/100ml2 of 20
2024—2012 cfu/100ml14 cfu/100ml0
2025excellent2014 cfu/100ml12 cfu/100ml0
2026—1011 cfu/100ml11 cfu/100ml0

Geometric mean of Environment Agency samples per calendar year (the standard bathing-water statistic). "High readings" are samples at or above 500 E. coli or 200 enterococci cfu/100ml.

Marazion — frequently asked questions

Is it safe to swim at Marazion today?

Marazion is currently rated RED: Storm overflow discharging within 5 km right now. Incoming/high tide may carry discharge closer to shore. This is guidance only — also check official alerts and use your judgement.

Has there been a sewage spill near Marazion?

337 storm-overflow spills were recorded near Marazion in 2025 (EA Event Duration Monitoring), and 100 spill events have been logged nearby so far this year.

What is Marazion's bathing water classification?

Marazion is classified excellent for 2025 by the Environment Agency.

Data & provenance

Last updated
7 min ago (2026-10-24 15:00 UTC)
Sources
Environment Agency (samples & classification), South West Water (overflows), EA EDM (annual spills), Open-Meteo (rainfall & tide). Full list on about.
Confidence
High — official classification, 10 outfalls monitored within 5 km.
Risk model
v0.4
Download
Sample timeline (JSON) · All beaches (CSV)
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