00878 GW/GWUDI Source Detail | Data Online | Oregon Drinking Water Services

OHA Drinking Water Services

PWS ID: 00878 ---- TIGARD, CITY OF

GW/GWUDI Source Detail

Non-purchased Groundwater/GWUDI Sources:

SRC-CB - ASR WELL 1
SRC-DA - WELL #2
SRC-HA - ASR WELL 2
SRC-IA - ASR WELL 3
SRC-CA - WELL #1 (1-2%) (Inactive)
SRC-EA - WELL #3 (Inactive)

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SRC-CB: ASR WELL 1

GW, Active, Seasonal ---- Operating Period: Jan 1 - Dec 31

Disinfection: RESID. MAINT. HYPOCHLORINATION

Sensitivity Analysis Data

Aquifer sensitivity:	Moderate	Surface water within 500 feet:	No
Construction adequate?:	Yes	Surface water type:	Unknown
E. coli sources within 2-year time-of-travel:	Yes	Data last updated:	10/11/2013

Monthly Assessment Monitoring Data

Monthly Assessment Monitoring Required? No
No monthly assessment monitoring schedule found.
No historic GWUDI data were found.

SRC-DA: WELL #2

GW, Active, Seasonal ---- Operating Period: Jan 1 - Dec 31

Disinfection: RESID. MAINT. HYPOCHLORINATION

Sensitivity Analysis Data

Aquifer sensitivity:	High	Surface water within 500 feet:	No
Construction adequate?:	No - Seal Not Constructed Properly	Surface water type:	Unknown
E. coli sources within 2-year time-of-travel:	Yes	Data last updated:	10/11/2013

Monthly Assessment Monitoring Data

Monthly Assessment Monitoring Required? Completed

Monthly Schedule (Closed): 1 sample(s) per month to be taken beginning 1/1/2010 - 12/31/2010

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Total
# Samples TC+ E. coli+	0 - -	0 - -	0 - -	0 - -	1 0 0	1 0 0	1 0 0	1 0 0	2 2 0	0 - -	0 - -	0 - -	6 2 0
Outcome/Determination: Low Risk

No historic GWUDI data were found.

SRC-HA: ASR WELL 2

GW, Active, Seasonal ---- Operating Period Unknown

Disinfection: RESID. MAINT. HYPOCHLORINATION

Sensitivity Analysis Data

Aquifer sensitivity:	Moderate	Surface water within 500 feet:	No
Construction adequate?:	Yes	Surface water type:	Unknown
E. coli sources within 2-year time-of-travel:	Yes	Data last updated:	8/11/2021

Monthly Assessment Monitoring Data

Monthly Assessment Monitoring Required? No
No monthly assessment monitoring schedule found.
No historic GWUDI data were found.

SRC-IA: ASR WELL 3

GW, Active, Seasonal ---- Operating Period Unknown

Disinfection: RESID. MAINT. HYPOCHLORINATION

Sensitivity Analysis Data

Aquifer sensitivity:	Low	Surface water within 500 feet:	No
Construction adequate?:	Yes	Surface water type:	Unknown
E. coli sources within 2-year time-of-travel:	Yes	Data last updated:	11/4/2025

Monthly Assessment Monitoring Data

Monthly Assessment Monitoring Required? No
No monthly assessment monitoring schedule found.
No historic GWUDI data were found.

SRC-CA: WELL #1 (1-2%)

GW, Inactive (Abandoned), Other ---- Operating Period: Jan 1 - Dec 31

Disinfection: RESID. MAINT. HYPOCHLORINATION

Sensitivity Analysis Data

Aquifer sensitivity:	High	Surface water within 500 feet:	No
Construction adequate?:	Yes	Surface water type:	Unknown
E. coli sources within 2-year time-of-travel:	Yes	Data last updated:	3/9/2006

Monthly Assessment Monitoring Data

Monthly Assessment Monitoring Required? Pending
No monthly assessment monitoring schedule found.
No historic GWUDI data were found.

SRC-EA: WELL #3

GW, Inactive (Disconnected), Other ---- Operating Period Unknown

Disinfection: None

Sensitivity Analysis Data

Aquifer sensitivity:	High	Surface water within 500 feet:	No
Construction adequate?:	Yes	Surface water type:	Unknown
E. coli sources within 2-year time-of-travel:	Yes	Data last updated:	8/16/2005

Monthly Assessment Monitoring Data

Monthly Assessment Monitoring Required? No
No monthly assessment monitoring schedule found.
No historic GWUDI data were found.

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