OHA Drinking Water Services
OR41
PWS ID: 00878 ---- TIGARD, CITY OF
GW/GWUDI Source Detail

Non-purchased Groundwater/GWUDI Sources:
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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.
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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
 JanFebMarAprMayJunJulAugSepOctNovDecTotal
# 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.
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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.
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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.
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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.
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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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