Arabs live in a computer game world of heroes in unending war and shooting and glory. In this universe there is no work, no learning, no food nor water. The issue of underground water quality deterioration is totally out of the range of their collective discourse (Ask the suicide bomber mother above. Ask fast, before she is gone). It could be supernova A4 exploding 4 million light years away. Without any real relevance.
But the German Institute of Environmental Geochemistry, University of Heidelberg, has been monitoring for seven years now the nitrate levels in Gaza's aquifer.
The most recent samples collected in 2007 showed 90% of the having NO3− concentrations that are several times higher than the WHO standards of 50 mg/L. NO3− source materials are animal manure N, synthetic NH4 based fertilizers, and wastewater/sludge. The average concentrations of N in the sludge, manure and soil of Gaza were 2.9%, 1% and 0.08%, respectively. The range in δ15N of solid manure samples was + 7.5 to + 11.9‰. The range in δ15N of sludge samples was + 4.6 to + 7.4‰, while four brands of synthetic fertilizers commonly used in Gaza had δ15N ranging from + 0.2 to + 1.0‰. Sludge amended soil had δ15N ranging from + 2.0 to + 7.3‰. For both δ18O and δ15N, the ranges of groundwater NO3− were − 0.1 to + 9.3‰ and + 3.2 to 12.8‰, respectively. No significant bacterial denitrification is taking place in the Gaza Strip aquifer. Nitrate was predominantly derived from manure and, provided δ15N of sludge represents the maximum δ15N of human waste, to a lesser extent from septic effluents/sludge. Synthetic fertilizers were a minor source.The study confirms that we all know. Palestinian agriculture uses little chemical fertilizers, it is all "organic" and "bio". Animal manure and untreated human sewage are being used as fertilizers, which lixiviates into the aquifer. Given high freatic water levels, no self-healing denitrification is taking place in Gaza. Local groundwater is therefore unfit for drinking (Israel supplies all of Gaza's drinking water).
To say it in non-technical way, let say that German scientists have documented that our Arab neighbors in Gaza are defecating in their wells and fouling the water.
Before Israel evacuated (good word) Gaza, the world and the United Nations maintained that the destruction of Gaza's water resources was direct consequence of the military occupation, as if Israeli soldiers were forcing Arabs to shit in the wells and the wadis. I dont know what they are saying now.