Public Water System: Atascadero Mutual Water Co

MyTapWater.org's tap water quality report is the compilation of data collected from federal, state, and local government agencies, most prominently the EPA. We strive to populate the report with the latest data concerning water contaminants, lead and copper levels, and water quality violations. We only collect drinking water data from public water systems.

PWS Service Information
PWS ID: CA4010002
Type: Community water system
EPA Region: 09
Primary Service Area: Residential Area
Primary Source: Surface water purchased
Population Served: 31,536
Contact Information
NEIL, JOHN
NEIL, JOHN
P.O. BOX 6075
ATASCADERO, CA 93423

This public water system services 1 zip code in 1 municipality in 1 county.

Summary Results


A summary view of the the times a water contaminant was tested and found to exceed the level set by the EPA (the MCL).

Maximum Contaminant Levels Exceeded (by year):

2013   (1) 2014   (0) 2015   (0)
chlorate

Contaminant Detailed Results


This a view of violations of maximum contaminant levels. In the expanded view you can see each know test date for a given contaminant, the result of the test, the minimum level that can be recognized in a test (MRL), and upper limit that is considered healthy (HRL).

chlorate
Is this in your home's pipes?

Year Test Date MRL HRL Test Result
2013 2013-10-30 20 210 130
2013 2013-10-30 20 210 410
2013 2013-10-30 20 210 250
2013 2013-10-30 20 210 250
2013 2013-10-30 20 210 240
2013 2013-10-30 20 210 140
2013 2013-10-30 20 210 100
2013 2013-10-30 20 210 370
2013 2013-04-30 20 210 64
2013 2013-04-30 20 210 66
2013 2013-04-30 20 210 68
2013 2013-04-30 20 210 180
2013 2013-04-30 20 210 350
2013 2013-04-30 20 210 190
2013 2013-04-30 20 210 120
2013 2013-04-30 20 210 130

Other Water Contaminants Tested


The following contaminants were tested and within national EPA guidelines.

The last mile of pipe makes a big difference, learn more about testing your water.

Contaminant MRL HRL Avg Result
strontium 0.3 1500 353.125 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-30 0.3 1500 280
2013 2013-10-30 0.3 1500 340
2013 2013-10-30 0.3 1500 360
2013 2013-10-30 0.3 1500 340
2013 2013-10-30 0.3 1500 280
2013 2013-10-30 0.3 1500 370
2013 2013-10-30 0.3 1500 450
2013 2013-10-30 0.3 1500 350
2013 2013-04-30 0.3 1500 300
2013 2013-04-30 0.3 1500 510
2013 2013-04-30 0.3 1500 320
2013 2013-04-30 0.3 1500 370
2013 2013-04-30 0.3 1500 300
2013 2013-04-30 0.3 1500 360
2013 2013-04-30 0.3 1500 310
2013 2013-04-30 0.3 1500 410
vanadium 0.2 21 1.96 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-30 0.2 21 0.98
2013 2013-10-30 0.2 21 0.98
2013 2013-10-30 0.2 21 1.8
2013 2013-10-30 0.2 21 1.6
2013 2013-10-30 0.2 21 1.8
2013 2013-10-30 0.2 21 2.3
2013 2013-10-30 0.2 21 1
2013 2013-10-30 0.2 21 2
2013 2013-04-30 0.2 21 1.6
2013 2013-04-30 0.2 21 3
2013 2013-04-30 0.2 21 1.6
2013 2013-04-30 0.2 21 2
2013 2013-04-30 0.2 21 2.4
2013 2013-04-30 0.2 21 2.4
2013 2013-04-30 0.2 21 1.9
2013 2013-04-30 0.2 21 4
molybdenum 1 40 4.525 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-30 1 40 5.7
2013 2013-10-30 1 40 5.7
2013 2013-10-30 1 40 4.3
2013 2013-10-30 1 40 3.6
2013 2013-10-30 1 40 3.5
2013 2013-10-30 1 40 4
2013 2013-10-30 1 40 2.8
2013 2013-10-30 1 40 3.6
2013 2013-04-30 1 40 6.5
2013 2013-04-30 1 40 5.4
2013 2013-04-30 1 40 4.2
2013 2013-04-30 1 40 4.2
2013 2013-04-30 1 40 6.3
2013 2013-04-30 1 40 4.4
2013 2013-04-30 1 40 4.2
2013 2013-04-30 1 40 4
1,1-dichloroethane 0.03 6.14 < 0.03 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-30 0.03 6.14 < 0.03
2013 2013-10-30 0.03 6.14 < 0.03
2013 2013-10-30 0.03 6.14 < 0.03
2013 2013-10-30 0.03 6.14 < 0.03
2013 2013-04-30 0.03 6.14 < 0.03
2013 2013-04-30 0.03 6.14 < 0.03
2013 2013-04-30 0.03 6.14 < 0.03
2013 2013-04-30 0.03 6.14 < 0.03
chromium 0.2 100 0.1106 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-30 0.2 100 < 0.2
2013 2013-10-30 0.2 100 < 0.2
2013 2013-10-30 0.2 100 0.29
2013 2013-10-30 0.2 100 < 0.2
2013 2013-10-30 0.2 100 < 0.2
2013 2013-10-30 0.2 100 < 0.2
2013 2013-10-30 0.2 100 < 0.2
2013 2013-10-30 0.2 100 < 0.2
2013 2013-04-30 0.2 100 < 0.2
2013 2013-04-30 0.2 100 0.26
2013 2013-04-30 0.2 100 0.24
2013 2013-04-30 0.2 100 0.31
2013 2013-04-30 0.2 100 < 0.2
2013 2013-04-30 0.2 100 0.24
2013 2013-04-30 0.2 100 0.21
2013 2013-04-30 0.2 100 0.22
cobalt 1 70 < 1 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-30 1 70 < 1
2013 2013-10-30 1 70 < 1
2013 2013-10-30 1 70 < 1
2013 2013-10-30 1 70 < 1
2013 2013-10-30 1 70 < 1
2013 2013-10-30 1 70 < 1
2013 2013-10-30 1 70 < 1
2013 2013-10-30 1 70 < 1
2013 2013-04-30 1 70 < 1
2013 2013-04-30 1 70 < 1
2013 2013-04-30 1 70 < 1
2013 2013-04-30 1 70 < 1
2013 2013-04-30 1 70 < 1
2013 2013-04-30 1 70 < 1
2013 2013-04-30 1 70 < 1
2013 2013-04-30 1 70 < 1
chromium-6 0.03 0 0.1638 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-30 0.03 0 0.097
2013 2013-10-30 0.03 0 0.32
2013 2013-10-30 0.03 0 0.11
2013 2013-10-30 0.03 0 0.24
2013 2013-10-30 0.03 0 0.24
2013 2013-10-30 0.03 0 0.14
2013 2013-10-30 0.03 0 0.12
2013 2013-10-30 0.03 0 0.14
2013 2013-04-30 0.03 0 0.1
2013 2013-04-30 0.03 0 0.094
2013 2013-04-30 0.03 0 0.19
2013 2013-04-30 0.03 0 0.23
2013 2013-04-30 0.03 0 0.1
2013 2013-04-30 0.03 0 0.19
2013 2013-04-30 0.03 0 0.15
2013 2013-04-30 0.03 0 0.16
bromomethane 0.2 140 < 0.2 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-30 0.2 140 < 0.2
2013 2013-10-30 0.2 140 < 0.2
2013 2013-10-30 0.2 140 < 0.2
2013 2013-10-30 0.2 140 < 0.2
2013 2013-04-30 0.2 140 < 0.2
2013 2013-04-30 0.2 140 < 0.2
2013 2013-04-30 0.2 140 < 0.2
2013 2013-04-30 0.2 140 < 0.2
chloromethane 0.2 2.69 < 0.2 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-30 0.2 2.69 < 0.2
2013 2013-10-30 0.2 2.69 < 0.2
2013 2013-10-30 0.2 2.69 < 0.2
2013 2013-10-30 0.2 2.69 < 0.2
2013 2013-04-30 0.2 2.69 < 0.2
2013 2013-04-30 0.2 2.69 < 0.2
2013 2013-04-30 0.2 2.69 < 0.2
2013 2013-04-30 0.2 2.69 < 0.2
1,4-dioxane 0.07 0.35 0.0229 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-30 0.07 0.35 < 0.07
2013 2013-10-30 0.07 0.35 < 0.07
2013 2013-10-30 0.07 0.35 < 0.07
2013 2013-10-30 0.07 0.35 0.11
2013 2013-04-30 0.07 0.35 < 0.07
2013 2013-04-30 0.07 0.35 0.073
2013 2013-04-30 0.07 0.35 < 0.07
2013 2013-04-30 0.07 0.35 < 0.07
PFNA 0.02 0 < 0.02 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-30 0.02 0 < 0.02
2013 2013-10-30 0.02 0 < 0.02
2013 2013-10-30 0.02 0 < 0.02
2013 2013-10-30 0.02 0 < 0.02
2013 2013-04-30 0.02 0 < 0.02
2013 2013-04-30 0.02 0 < 0.02
2013 2013-04-30 0.02 0 < 0.02
2013 2013-04-30 0.02 0 < 0.02
1,2,3-trichloropropane 0.03 0.0004 < 0.03 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-30 0.03 0.0004 < 0.03
2013 2013-10-30 0.03 0.0004 < 0.03
2013 2013-10-30 0.03 0.0004 < 0.03
2013 2013-10-30 0.03 0.0004 < 0.03
2013 2013-04-30 0.03 0.0004 < 0.03
2013 2013-04-30 0.03 0.0004 < 0.03
2013 2013-04-30 0.03 0.0004 < 0.03
2013 2013-04-30 0.03 0.0004 < 0.03
PFOS 0.04 0.07 < 0.04 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-30 0.04 0.07 < 0.04
2013 2013-10-30 0.04 0.07 < 0.04
2013 2013-10-30 0.04 0.07 < 0.04
2013 2013-10-30 0.04 0.07 < 0.04
2013 2013-04-30 0.04 0.07 < 0.04
2013 2013-04-30 0.04 0.07 < 0.04
2013 2013-04-30 0.04 0.07 < 0.04
2013 2013-04-30 0.04 0.07 < 0.04
PFHxS 0.03 0 < 0.03 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-30 0.03 0 < 0.03
2013 2013-10-30 0.03 0 < 0.03
2013 2013-10-30 0.03 0 < 0.03
2013 2013-10-30 0.03 0 < 0.03
2013 2013-04-30 0.03 0 < 0.03
2013 2013-04-30 0.03 0 < 0.03
2013 2013-04-30 0.03 0 < 0.03
2013 2013-04-30 0.03 0 < 0.03
PFHpA 0.01 0 < 0.01 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-30 0.01 0 < 0.01
2013 2013-10-30 0.01 0 < 0.01
2013 2013-10-30 0.01 0 < 0.01
2013 2013-10-30 0.01 0 < 0.01
2013 2013-04-30 0.01 0 < 0.01
2013 2013-04-30 0.01 0 < 0.01
2013 2013-04-30 0.01 0 < 0.01
2013 2013-04-30 0.01 0 < 0.01
HCFC-22 0.08 0 < 0.08 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-30 0.08 0 < 0.08
2013 2013-10-30 0.08 0 < 0.08
2013 2013-10-30 0.08 0 < 0.08
2013 2013-10-30 0.08 0 < 0.08
2013 2013-04-30 0.08 0 < 0.08
2013 2013-04-30 0.08 0 < 0.08
2013 2013-04-30 0.08 0 < 0.08
2013 2013-04-30 0.08 0 < 0.08
1,3-butadiene 0.1 0.0103 < 0.1 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-30 0.1 0.0103 < 0.1
2013 2013-10-30 0.1 0.0103 < 0.1
2013 2013-10-30 0.1 0.0103 < 0.1
2013 2013-10-30 0.1 0.0103 < 0.1
2013 2013-04-30 0.1 0.0103 < 0.1
2013 2013-04-30 0.1 0.0103 < 0.1
2013 2013-04-30 0.1 0.0103 < 0.1
2013 2013-04-30 0.1 0.0103 < 0.1
Halon 1011 0.06 90 < 0.06 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-30 0.06 90 < 0.06
2013 2013-10-30 0.06 90 < 0.06
2013 2013-10-30 0.06 90 < 0.06
2013 2013-10-30 0.06 90 < 0.06
2013 2013-04-30 0.06 90 < 0.06
2013 2013-04-30 0.06 90 < 0.06
2013 2013-04-30 0.06 90 < 0.06
2013 2013-04-30 0.06 90 < 0.06
PFBS 0.09 0 < 0.09 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-30 0.09 0 < 0.09
2013 2013-10-30 0.09 0 < 0.09
2013 2013-10-30 0.09 0 < 0.09
2013 2013-10-30 0.09 0 < 0.09
2013 2013-04-30 0.09 0 < 0.09
2013 2013-04-30 0.09 0 < 0.09
2013 2013-04-30 0.09 0 < 0.09
2013 2013-04-30 0.09 0 < 0.09
PFOA 0.02 0.07 0.0035 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2013 2013-10-30 0.02 0.07 < 0.02
2013 2013-10-30 0.02 0.07 < 0.02
2013 2013-10-30 0.02 0.07 < 0.02
2013 2013-10-30 0.02 0.07 0.028
2013 2013-04-30 0.02 0.07 < 0.02
2013 2013-04-30 0.02 0.07 < 0.02
2013 2013-04-30 0.02 0.07 < 0.02
2013 2013-04-30 0.02 0.07 < 0.02

Lead and Copper Data


Lead and copper are recorded separately from other contaminants because of the Lead and Copper Rule. As with all other results, these are the findings at the water supply. Lead and copper can be — and often are — added to drinking water in between the water facility and a tap.

Sample ID Contaminant Sampling Start Date Sampling End Date Result
CA54627 copper 2016-01-01 2016-12-31 1.6mg/L
CA55022 lead 2016-01-01 2016-12-31 0mg/L
CA48394 copper 2015-01-01 2015-12-31 1.9mg/L
CA48979 lead 2015-01-01 2015-12-31 0mg/L
CA51292 lead 2015-07-01 2015-12-31 0mg/L
CA41224 copper 2012-01-01 2014-12-31 1.4mg/L
CA41692 lead 2012-01-01 2014-12-31 0mg/L
CA33760 copper 2013-01-01 2013-12-31 1.6mg/L
CA37504 lead 2013-01-01 2013-12-31 0mg/L
CA40182 lead 2013-07-01 2013-12-31 0mg/L
CA37505 lead 2012-07-01 2012-12-31 0mg/L
401000212166C copper 2012-01-01 2012-12-31 1.4mg/L
401000212166L lead 2012-01-01 2012-12-31 0.005mg/L
CA33730 copper 2012-01-01 2012-06-30 1.4mg/L
CA37477 lead 2012-01-01 2012-06-30 0mg/L
401000211167C copper 2011-01-01 2011-12-31 1.97mg/L
401000211167L lead 2011-01-01 2011-12-31 0.0061mg/L
CA33765 copper 2011-07-01 2011-12-31 1.5mg/L
CA37509 lead 2011-07-01 2011-12-31 0mg/L
CA33683 copper 2011-01-01 2011-06-30 1.97mg/L
CA37431 lead 2011-01-01 2011-06-30 0.0061mg/L
401000210350C copper 2010-01-01 2010-12-31 1.64mg/L
401000210350L lead 2010-01-01 2010-12-31 0.005mg/L
401000210168C copper 2010-01-01 2010-12-31 1.8mg/L
401000210168L lead 2010-01-01 2010-12-31 0.005mg/L
CA33681 copper 2010-01-01 2010-06-30 1.8mg/L
CA37430 lead 2010-01-01 2010-06-30 0mg/L
401000209357L1ST 6 lead 2009-01-01 2009-12-31 0.005mg/L
401000209169C copper 2009-01-01 2009-12-31 1.6mg/L
401000209169L lead 2009-01-01 2009-12-31 0.005mg/L
401000209209C copper 2009-01-01 2009-12-31 1.97mg/L
401000209209L lead 2009-01-01 2009-12-31 0.0061mg/L
401000209357L lead 2009-01-01 2009-12-31 0.005mg/L
401000208354LA1 lead 2008-01-01 2008-12-31 0.005mg/L
401000208354L lead 2008-01-01 2008-12-31 0.005mg/L

Violations


Known violations of the Safe Drinking Water Act as recorded by the EPA.

Compliance Dates Rule Violation Type Contaminant Name Status
1993-06-01 - 1993-06-30 Surface Water Treatment Rule Treatment Technique (SWTR and GWR) Surface Water Treatment Rule Returned to Compliance

What My Water Data Means


Water data isn't always easy to interpret, but by following the links on this page you should be able to have most of your questions answered. By clicking the name of a water contaminant or secondary substance you can learn about that specific substance. Ultimately this page should give you some insight towards learning if your water is safe, what water filter you should buy (if any), and how well your local water compares against other sources.

Sources


The origin of MyTapWater.org's water data is explained on our Data Sources page.

Why Is My Water Data Not More Recent?


The recency of the data for your ZIP code depends on the last your water source was tested, by a federal, state, or local agency. More information about the timing can be determined by learning about the dataset in question and seeing how often the EPA (other another governing body) mandated testing.