Pomona Mayor Decides to Run : Politics: Now that her injured son is recovering, Mayor Donna Smith will seek a third term March 5.

Ending weeks of indecision, Mayor Donna Smith has decided to seek a third term in the March 5 city election, where she will face five challengers, including Councilman Tomas Ursua.

Smith said she hesitated to run because of concern about the health of her 18-year-old son, who was injured at an Army training base in November, and her “frustration over a lack of a sense of teamwork on the council.”

But now that her son is recovering, Smith said, she has decided to seek reelection because her experience will be needed on a council that will include at least three new members.

Smith, 36, has led Pomona through some of its bitterest controversies, including the recall of Councilman C. L. (Clay) Bryant six months ago and the firing--over her objection--of the city administrator and police chief in 1989.

She will face a strong challenge from Ursua, 34, a builder who was her ally in the Bryant recall but who has more often been her antagonist. Ursua has criticized Smith’s leadership and promised to cut back on subsidies to developers while emphasizing job training, affordable housing and social services.

Others who have filed to run for mayor:

* Stewart A. Alexander, 39, a marketing consultant.

* Wayne S. Fowler, 48, an electronics technician.

* Harold A. Jackson Jr., 59, chaplain at a state school for youthful offenders and twice a Democratic nominee for state Assembly.

* Abe Tapia, 56, a business consultant who managed Bryant’s unsuccessful effort to defeat the recall.

Thursday was the deadline for candidates to file for mayor and three City Council seats.

The March election marks the expansion of the City Council from four members to six, plus the mayor. It also will be the first vote in which members will be elected by district, instead of citywide.

Voters last June approved the council expansion and district elections.

Four of the six council seats will be at stake. Ursua, who is in the middle of a four-year term, will continue on the council even if he loses his bid to become mayor. Boyd Bredenkamp, who replaced Bryant after the recall election, will serve on the council until 1993.

Councilwoman Nell Soto, 64, who works as a liaison to local governments for the Southern California Rapid Transit District, is the only council member seeking reelection. Councilman Mark A. T. Nymeyer announced in November that he will not run again.

Three candidates filed to run against Soto in District 1, which takes in the area from Garey Avenue west to the city limits, between the San Bernardino Freeway on the north and an irregular line that follows 2nd Street, the Union Pacific railroad tracks and Temple Avenue on the south.

They are:

* Robert D. Jackson, 33, a teacher.

* Reyes Rachel Madrigal, 57, associate professor of Spanish at Mt. San Antonio College.

* Timothy Smith, 40, an air-conditioning technician.

In District 5, which covers the southwestern portion of the city, including Phillips Ranch and the Westmont area, two candidates filed for the new council seat. They are:

* Charles B. Blanton, 43, planning commissioner and president of a design studio.

* Kenneth L. West, 39, a fiscal administrator with the Los Angeles County Sheriff’s Department.

Four candidates filed in District 6, which is all of the city north of the San Bernardino Freeway. They are:

* Edward S. Cortez, 50, a businessman and Planning Commission chairman.

* Stephen Quintero, 21, a student at Cal Poly Pomona.

* Robert L. Stoddard, 40, a salesman.

* Willie E. White, 54, outreach director of the Pomona Valley YMCA.

Because the incumbent, Nymeyer, is not seeking reelection in District 4, the filing deadline was extended to Wednesday. The district takes in the area from Garey Avenue east to the city limits between the San Bernardino Freeway on the north and 2nd Street and the Union Pacific railroad tracks on the south.

Those who had declared their intention to run by Thursday are:

* Jerry A. Keane, 33, a mechanic and planning commissioner.

* Paula Hastings Lantz, 44, an infant educator.

* Penni Moffatt, 39, a business owner.

* Rebecca A. Ryan, 47, an adult education teacher.

* William Paul Shelton, 35, a pool service owner.