Free tools · Drinking water · Western Cape
Is the tap water safe in Theewaterskloof (Caledon, Grabouw)?
The government’s latest official rating puts all 10 drinking-water systems in Theewaterskloof at low or medium risk. It’s the Department of Water and Sanitation’s Blue Drop risk assessment of 2024, published in March 2026. Theewaterskloof includes Caledon, Grabouw and Villiersdorp.
This is the government’s latest official assessment (published in March 2026, on data from July 2023 to June 2024), not a live test of your tap water or a guarantee that it’s safe.
- 0 of 10Drinking-water systems at high or critical riskBlue Drop risk 2024
- 0 of 8Sewage works in a critical stateGreen Drop 2024, below 31%
- LowWater losses riskNo Drop 2025, 25.0%
Each drinking-water system, 2024
| System | Risk |
|---|---|
| Bereaville | Low 16.9% |
| Botrivier | Low 20.2% |
| Caledon | Low 40.9% |
| Genadendal-WTW | Low 38.0% |
| Grabouw WTW | Low 27.5% |
| Greyton | Low 32.3% |
| Riviersonderend WTW | Low 33.0% |
| Tesselaarsdal WTW | Low 33.6% |
| Villiersdorp WTW | Low 38.2% |
| Voorstekraal | Low 26.8% |
The department’s risk rating for each system, from its Blue Drop risk assessment of 2024 (data from July 2023 to June 2024). Below 50% is low risk; 90% or more is critical.
What the ratings mean
The Department of Water and Sanitation rates each drinking-water system’s risk from four things: the size of its treatment works and how close it runs to capacity (35% of the rating), whether its water met the national drinking-water standard, SANS 241, in tests, and whether enough tests were done (35%), the skills of its staff (20%), and whether it has a water safety plan (10%).
The rating is a share of the worst possible score, so higher is worse: below 50% is low risk, 50% to under 70% medium, 70% to under 90% high, and 90% or more critical. It describes how a system was run and tested over a year, not the water in your glass today.
Your water today
For the water in your tap today, ask the Theewaterskloof Local Municipality. It’s responsible for the water here and issues boil-water notices. If it issues one, follow it.
The department’s report for the Western Cape has each system’s full scorecard: Blue Drop Progress Assessment Report 2025: Western Cape.
Sewage works
Sewage works don’t supply your tap, but what they release flows into rivers and dams, and the department’s Green Drop report links poorly treated sewage to risks for public health downstream. In its audit for 2024, none of the 8 works in Theewaterskloof were in a critical state.
| Works | Score | Category | Releases into |
|---|---|---|---|
| Botrivier | 58.3% | Average | Bot River |
| Caledon | 64.4% | Average | Baths River |
| Genadendal | 53.2% | Average | Sonderend River |
| Grabouw | 64.5% | Average | Klipdrift River a tributary of Palmiet River |
| Greyton | 54.6% | Average | Sonderend River |
| Riviersonderend | 53.2% | Average | Golf course (emergency discharge into the Sonderend River) |
| Tesselaarsdal | 54.9% | Average | Discharged from the plant to a storm water drain |
| Villiersdorp | 59.5% | Average | Elandsriver feeding Theewaterskloof Dam |
Green Drop audit for 2024 (July 2023 to June 2024), published in March 2026. The department’s categories: 90% or more is excellent, 80% good, 50% average, 31% very poor, and below 31% a critical state. Higher is better. “Releases into” is where the works discharges, as the report prints it.
Water losses
The department’s No Drop assessment of 2025 rates the Theewaterskloof Local Municipality’s management of water losses at low risk (25.0%; below 50% is low risk, 90% or more critical). In 2023/24, 48% of the water it put into its pipes was never billed: lost to leaks and bursts, taken illegally, or used without a bill. The department rates the accuracy of those figures as medium (mostly metered). Its report counts more than 40% as extremely poor, and less than 10% as excellent.
The last full audit: Blue Drop scores, 2023 (10 systems)
The full Blue Drop audit of July 2021 to June 2022, published in 2023. Higher is better: 95% or more is excellent, and below 31% a critical state. Systems may be named differently from 2024.
| System | Score | Category |
|---|---|---|
| Bereaville | 88.1% | Good |
| Botrivier | 96.6% | Excellent |
| Caledon | 84.2% | Good |
| Genadendal | 78.3% | Average |
| Grabouw | 92.1% | Good |
| Greyton | 93.2% | Good |
| Riviersonderend | 89.0% | Good |
| Tesselaarsdal | 83.0% | Good |
| Villiersdorp | 93.9% | Good |
| Voorstekraal | 94.7% | Good |
Elsewhere in Overberg
- Cape Agulhas1 of 9
- Overstrand (Hermanus)0 of 8
- Swellendam0 of 4
Drinking-water systems at high or critical risk, of all those rated.
More for Theewaterskloof
- Theewaterskloof on one pageEvery figure we hold, with its source
- TheewaterskloofWards, electricity, water
- Is your tap water safe?Our story
- Every municipalityTap water nationally
Source: Department of Water and Sanitation, Blue Drop Progress Assessment Report 2025: Western Cape, Blue Drop Report 2023: Western Cape, Green Drop Report 2025: Western Cape, No Drop Progress Assessment Report 2025 (complete), through our water quality dataset, release 2026-11-12.