OHA Drinking Water Services
OR41
PWS ID: 00869 ---- THE DALLES, CITY OF
GW/GWUDI Source Detail

Non-purchased Groundwater/GWUDI Sources:
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SRC-BA:  WELL #1 - LONE PINE
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: 4/22/2015
Monthly Assessment Monitoring Data
Monthly Assessment Monitoring Required? No

Monthly Schedule (Closed): 1 sample(s) per month to be taken beginning 5/1/2009 - 10/31/2009
 JanMarMarAprMayJunJulAugSepOctNovDecTotal
# Samples
TC+
E. coli+ 		0
-
-		 0
-
-		 0
-
-		 0
-
-		 1
0
0		 1
0
0		 1
0
0		 1
0
0		 1
0
0		 1
0
0		 0
-
-		 0
-
-		 6
0
0
Outcome/Determination:  Low Risk
No historic GWUDI data were found.
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SRC-CA:  WELL #2 - JORDAN ST
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 Missing or Unknown   Surface water type: Unknown
E. coli sources within 2-year time-of-travel: Yes   Data last updated: 4/23/2015
Monthly Assessment Monitoring Data
Monthly Assessment Monitoring Required? Completed

Monthly Schedule (Closed): 1 sample(s) per month to be taken beginning 4/1/2009 - 9/30/2009
 JanMarMarAprMayJunJulAugSepOctNovDecTotal
# Samples
TC+
E. coli+ 		0
-
-		 0
-
-		 0
-
-		 1
0
0		 1
0
0		 1
0
0		 1
0
0		 1
0
0		 1
0
0		 0
-
-		 0
-
-		 0
-
-		 6
0
0
Outcome/Determination:  Low Risk
No historic GWUDI data were found.
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SRC-DA:  WELL #3 - MARKS
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 Missing or Unknown   Surface water type: Unknown
E. coli sources within 2-year time-of-travel: Yes   Data last updated: 4/23/2015
Monthly Assessment Monitoring Data
Monthly Assessment Monitoring Required? Completed

Monthly Schedule (Closed): 1 sample(s) per month to be taken beginning 4/1/2009 - 9/30/2009
 JanMarMarAprMayJunJulAugSepOctNovDecTotal
# Samples
TC+
E. coli+ 		0
-
-		 0
-
-		 0
-
-		 1
0
0		 1
0
0		 1
0
0		 1
0
0		 1
0
0		 1
0
0		 0
-
-		 0
-
-		 0
-
-		 6
0
0
Outcome/Determination:  Low Risk
No historic GWUDI data were found.
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SRC-EA:  RIVERSIDE WELL #1
GW, Active, Permanent ---- Operating Period Unknown
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: 2/12/2026
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-EB:  RIBERSIDE WELL #2
GW, Active, Permanent ---- Operating Period Unknown
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: 2/12/2026
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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