Question: What level is considered safe for aresnic in drinking water?
About the article "Rice", section "Arsenic concerns".

Candidate passages:
Drinking water is considered a leading culprit for disease. 
The Safe Drinking Water Act, implemented in 1974, establishes rules and regulations to ensure safe drinking water for the public.
Standards are established across all states to ensure that all drinking water meets established standards. 
As a drinking water source, Lake Whatcom’s quality is in compliance for all tested chemicals, bacteria and turbidity.
Bellingham is a participant in the Partnership for Safe Water and the City’s drinking water also meets the higher standards set by this group.
For the past 10 years the City of Bellingham Public Works has received the Partnership for Safe Water’s Director Award for commitment to providing safe drinking water.  
Even after accounting for physical water availability or access, water quality could further reduce the amount of usable water available to a developing country for human consumption, sanitation, agriculture and industrial purposes, in addition to various ecosystem services.
The level of water quality depends on its intended purpose: Water that could be unfit for human consumption could be still usable in industrial or agriculture applications.
Yet parts of the world are experiencing extensive deterioration of water quality, in some cases even rendering the water unfit for agricultural or even industrial use.
For example in China, 54% of the Hai River basin surface water is so polluted that it is considered un-usable.
Development indicators tend to focus on access and availability of ‘safe water’, which the World Bank defines as ‘treated surface water and untreated but uncontaminated groundwater.’ Safe water is crucial not only for human health (on average,a human needs 20 litres of safe water for his daily ‘metabolic, hygienic and domestic needs’) but also for economic development and environmental health.
Yet, more than 1/3 of the world cannot drink their local water supply without additional treatment.
Safe water one of the eight Millennium Development Goals: ; “Halve, by 2015, the proportion of the population without sustainable access to safe drinking water and basic sanitation”,focused on increasing access to an ‘improved water source’ and to ‘improved sanitation’.
Yet even having access to an ‘improved water source’ does not guarantee the water’s quality, as it could lack proper treatment, become contaminated during transport or even home storage.
A study found that estimates of safe water, if accounting for water quality, could be dramatically reduce the proportion of a population with access to safe water, especially if the water sources were poorly maintained. 
The Nairobi water utility NCWSC says it has a stringent water quality monitoring programs to ensure the water they supply the city is safe for drinking.
However, due to high leakage in the network and intermittent supply treated water is sometimes recontaminated before it reaches the tap.
According to the Water Sector Regulatory Board, in 2009/10 only 76% of drinking water samples complied with standards for bacteriological quality, a level deemed unacceptable by the regulator.
This was the case despite a high level of chlorination that was deemed acceptable by the regulator with 91% of samples complying with the norms for residual chlorine.
Also, sometimes water is contaminated because of pipe bursts.
For instance, over 10 fatalities from water borne diseases were experienced in the slum Mukuru kwa Njenga in 2009.
Those who can afford it boil or filter water before drinking it, or buy bottled water.
Those who cannot afford this are forced to take their chances with tap water.