You are here: News - Local

Published: Saturday, Jan. 07, 2012

Los Osos makes progress on water quality

Steps battle the dual problems of nitrate pollution and saltwater intrusion in the town’s aquifers

tool name

close
tool goes here
| dsneed@thetribunenews.com

State water officials say progress is being made to reverse the degradation of the Los Osos groundwater basin.

In a recently released report, the Central Coast Regional Water Quality Control Board said a combination of reduced demand, nitrate control and better management of underground aquifers is poised to begin improving water quality in the seaside community.

“We are very optimistic that it is going to be a long-term solution,” said David LaCaro, an environmental scientist with the regional board. “There is some momentum here.”

The groundwater basin faces two severe, interconnected problems: nitrate pollution in the upper aquifer and saltwater intrusion in the lower one.

“The nitrate problem has caused purveyors to curtail shallow well use in recent years,” LaCaro said. “This shallow aquifer abandonment has led to increased deeper pumping, which has greatly exacerbated seawater intrusion.”

A variety of steps are being taken to deal with the problem. One of the main ones is the planned construction of the $189 million sewer system, which is scheduled to begin later this year.

The sewer system will replace the hundreds of septic systems in the community that are the source of the nitrate pollution, LaCaro said. The system’s effluent will be used for irrigation and other uses that will reduce demand on the aquifers, and some of the effluent will be returned to the upper aquifer via percolation ponds.

Other steps being taken include:

• Retrofits, installation of water meters and other conservation steps that will reduce pumping in the lower aquifer.

• Increased upper aquifer pumping using nitrate removal via ion exchange and blending with cleaner water.

• Minimizing pumping from the westerly portion of the aquifer to reduce intrusion.

• Preparation of a management plan for the groundwater basin.

No one is willing to speculate on when improvements in water quality will be realized, however.

“With groundwater, we never know; it’s a tough call,” LaCaro said.

The Los Osos groundwater basin is jointly managed by the county and the three water purveyors serving the community: the Los Osos Community Services District, Golden State Water Co. and S&T Mutual Water Co. These four entities agreed to work together to manage the groundwater basin as a result of a San Luis Obispo Superior Court judgment reached in 2008.

About comments

Reader comments on SanLuisObispo.com are the opinions of the writer, not The Tribune. If you see an objectionable comment, click the "report abuse" button below it. We will delete comments containing inappropriate links, obscenities, hate speech, and personal attacks. Flagrant or repeat violators will be banned. See more about comments here.

What you should know about comments on SanLuisObispo.com

SanLuisObispo.com is happy to provide a forum for reader interaction, discussion, feedback and reaction to our stories. However, we reserve the right to delete inappropriate comments or ban users who can't play nice. See our full terms of service here.

Here are some rules of the road:

  • Keep your comments civil. Don't insult one another or the subjects of our articles. If you think a comment violates our guidelines click the "report abuse" button. Responding to the comment will only encourage bad behavior.
  • Don't use profanities, vulgarities or hate speech. This is a general interest news site. Sometimes, there are children present. Don't say anything in a way you wouldn't want your own child to hear.
  • Do not attack other users; focus your comments on issues, not individuals.
  • Stay on topic. Only post comments relevant to the article at hand. If you want to discuss an issue with a specific user, click on his profile name and leave him a public message.
  • Do not copy and paste outside material into the comment box.
  • Don't repeat the same comment over and over. We heard you the first time.
  • Do not use the commenting system for advertising. That's spam and it isn't allowed.
  • Don't use all capital letters. That's akin to yelling and not appreciated by the audience.

You should also know that The Tribune does not screen comments before they are posted. You are more likely to see inappropriate comments before our staff does, so we ask that you click the "report abuse" button to submit those comments for moderator review. You also may notify us via email at webmaster@thetribunenews.com. Note the headline on which the comment is made and tell us the profile name of the user who made the comment. Remember, comment moderation is subjective. You may find some material objectionable that we won't and vice versa.

If you submit a comment, the username of your account will appear along with it. Users cannot remove their own comments once they have submitted them, but you may ask our staff to retract one of your comments by sending an email to webmaster@thetribunenews.com. Again, make sure you note the headline on which the comment is made and tell us your profile name.

Our news, your way

Get breaking news on your cell phone

Sign up for breaking news alerts from SanLuisObispo.com and get the latest news sent to your cell phone via text message.

Type in your cell phone number

( ) -

I accept the terms and conditions (click to view)

Keep your phone handy!

Upon hitting the Sign up! button, you will receive a message with a four-digit code at the end. Enter this number on the next screen and press the Confirm button.

Terms and Conditions:

By signing up for alerts from this site, you are signing up for a program that may include up to 5 SMS text alert(s) per alert category per day. There is no service fee charged per month but your carrier's standard text messaging and other charges may apply. You may stop this subscription service at any time by sending the text message "STOP" to 72737. You must be at least thirteen (13) years of age to use our alert services. If you are between 13 and 17 years old, you agree that you have received parental permission both to complete the registration process and to receive SMS content on your cell phone. For help, send the text message "HELP" to 72737. This service will work with ATT, Verizon, Sprint, Nextel, Alltell, US Cellular, Cincinnati Bell, Boost, Virgin Mobile USA, Celluar South, Telos, Centennial, East Kentucky Network, Cellcom, Immix and Rural Celluar.

Quick Job Search
Top Jobs