Dammam, Khobar, and most of the Eastern Province receive drinking water from the Saline Water Conversion Corporation's (SWCC) Jubail desalination plants via a 130km transmission pipeline. Desalinated seawater has a very different chemical profile from Riyadh's deep aquifer groundwater: lower TDS (typically 200–400 ppm), lower alkalinity, and higher chloride content from the residual seawater mineral balance. This chemistry is far more aggressive toward copper plumbing fittings and galvanised steel pipes than Riyadh's water.
SWCC Water vs Riyadh Groundwater: Key Plumbing Differences
- Chloride content: Eastern Province SWCC water contains 50–120 ppm chloride, vs 30–60 ppm in Riyadh groundwater. Elevated chloride causes pitting corrosion on copper pipes — small holes that grow through the pipe wall.
- Low alkalinity: Desalinated water has low calcium carbonate content (low Langelier Saturation Index), meaning it is slightly corrosive rather than scale-forming. It doesn't build up calcium inside pipes (a Riyadh problem) but actively attacks pipe walls.
- Galvanised steel: Chloride-rich desalinated water attacks galvanised coating faster than low-chloride groundwater. Eastern Province galvanised pipes corrode through in 15–20 years vs 25–35 years in Riyadh.
- Copper fittings: Dezincification of brass fittings is accelerated by high-chloride water. Brass compression fittings (common in older Eastern Province plumbing) develop green corrosion deposits and eventually fail.
Best Pipe Materials for Dammam Plumbing
- PPR-PN20 (Best choice): Completely immune to chloride corrosion, no dezincification, smooth bore prevents scale, 50-year rated life. Heat-fusion welded — no metal fittings in the water path.
- CPVC (Second choice): Good chloride resistance, suitable for hot water lines. Avoid brass CPVC fittings — use plastic CPVC-to-PPR adaptors at connection points.
- Copper with plastic fittings: Copper pipe itself has adequate chloride resistance, but traditional brass compression fittings fail in Dammam's water. If keeping copper pipe, replace all compression fittings with plastic push-fit or solder-type connections.
- Avoid: Galvanised steel, yellow brass fittings, and standard carbon steel pipe.
Common Plumbing Issues in Dammam Properties
- Green deposits on brass taps and fittings: Dezincification of brass in SWCC chloride water. Replace with chrome-plated or stainless fittings.
- Small persistent leaks at compression joints: Chloride-corroded brass olive rings. Requires refitting with new fittings or conversion to push-fit.
- Pinhole leaks in copper supply lines: Chloride pitting corrosion through the pipe wall. Individual repairs possible with compression repair couplings, but whole-section PPR replacement is the permanent solution.
- Low water pressure despite good pump: Often low alkalinity SWCC water has corroded partially through pipe walls, causing small leaks that bleed pressure.
Frequently Asked Questions
QWhy does Dammam's water cause more pipe leaks than water in other Saudi cities?
SWCC desalinated water has higher chloride content than Saudi groundwater sources. Chloride ions penetrate the passive oxide layer on copper and stainless steel surfaces, causing pitting corrosion — small holes that grow through the pipe wall over 10–20 years. Galvanised steel and brass fittings are even more vulnerable. PPR plastic pipes are completely immune to chloride corrosion and are the long-term solution for Eastern Province plumbing.
QHow much does a full PPR pipe replacement cost in Dammam?
A full hot and cold PPR supply pipe replacement for a 4-bedroom Dammam villa costs SAR 9,000–18,000 depending on building size, number of bathrooms, and pipe routing complexity. This includes all labour, PPR pipe and fittings, basic civil works to access pipes in walls and slabs, and reinstatement of surface finishes. The investment eliminates virtually all plumbing maintenance costs for the next 30–50 years.
QIs there a water softener that works with Dammam's desalinated water?
Traditional ion-exchange water softeners work on calcium/magnesium hardness — they are less effective with Dammam's low-TDS desalinated water because there is relatively little calcium to soften. The primary corrosion concern in Dammam is chloride, not calcium hardness. A carbon-block whole-house filter that removes chlorine and reduces chloride concentration is more beneficial than a softener for Dammam properties. Combined with PPR piping, this eliminates the main corrosion risk.
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