Public Water System: Rio Alto Water District

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: CA5210005
Type: Community water system
EPA Region: 09
Primary Service Area: Residential Area
Primary Source: Ground water
Population Served: 3,316
Contact Information
SLACK, MARTHA
SLACK, MARTHA
22099 River View Drive
COTTONWOOD, CA 96022

This public water system services 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   (0) 2014   (0) 2015   (1)
vanadium

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).

vanadium

Year Test Date MRL HRL Test Result
2015 2015-09-15 0.2 21 21
2015 2015-09-15 0.2 21 19
2015 2015-09-15 0.2 21 13
2015 2015-09-15 0.2 21 19
2015 2015-09-15 0.2 21 18
2015 2015-03-09 0.2 21 20.5
2015 2015-03-09 0.2 21 15.7
2015 2015-03-09 0.2 21 13.7
2015 2015-03-09 0.2 21 25.5
2015 2015-03-09 0.2 21 21.2

Other Water Contaminants Tested


The following contaminants were tested and within national EPA guidelines.

Contaminant MRL HRL Avg Result
chromium 0.2 100 3.965 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-09-15 0.2 100 4.4
2015 2015-09-15 0.2 100 4.1
2015 2015-09-15 0.2 100 4
2015 2015-09-15 0.2 100 5.2
2015 2015-09-15 0.2 100 4.4
2015 2015-03-09 0.2 100 3.88
2015 2015-03-09 0.2 100 3.22
2015 2015-03-09 0.2 100 3.42
2015 2015-03-09 0.2 100 3.58
2015 2015-03-09 0.2 100 3.45
cobalt 1 70 < 1 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-09-15 1 70 < 1
2015 2015-09-15 1 70 < 1
2015 2015-09-15 1 70 < 1
2015 2015-09-15 1 70 < 1
2015 2015-09-15 1 70 < 1
2015 2015-03-09 1 70 < 1
2015 2015-03-09 1 70 < 1
2015 2015-03-09 1 70 < 1
2015 2015-03-09 1 70 < 1
2015 2015-03-09 1 70 < 1
manganese 1 0 3.59 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-09-15 1 0 < 1
2015 2015-09-15 1 0 1.1
2015 2015-09-15 1 0 2.8
2015 2015-09-15 1 0 < 1
2015 2015-09-15 1 0 < 1
2015 2015-03-09 1 0 < 1
2015 2015-03-09 1 0 17.2
2015 2015-03-09 1 0 14.8
2015 2015-03-09 1 0 < 1
2015 2015-03-09 1 0 < 1
molybdenum 1 40 0.11 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-09-15 1 40 < 1
2015 2015-09-15 1 40 < 1
2015 2015-09-15 1 40 < 1
2015 2015-09-15 1 40 < 1
2015 2015-09-15 1 40 < 1
2015 2015-03-09 1 40 < 1
2015 2015-03-09 1 40 < 1
2015 2015-03-09 1 40 < 1
2015 2015-03-09 1 40 1.1
2015 2015-03-09 1 40 < 1
strontium 0.3 1500 108.7 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-09-15 0.3 1500 100
2015 2015-09-15 0.3 1500 85
2015 2015-09-15 0.3 1500 120
2015 2015-09-15 0.3 1500 96
2015 2015-09-15 0.3 1500 90
2015 2015-03-09 0.3 1500 114
2015 2015-03-09 0.3 1500 111
2015 2015-03-09 0.3 1500 147
2015 2015-03-09 0.3 1500 108
2015 2015-03-09 0.3 1500 116
chlorate 20 210 < 20 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-09-15 20 210 < 20
2015 2015-09-15 20 210 < 20
2015 2015-09-15 20 210 < 20
2015 2015-09-15 20 210 < 20
2015 2015-09-15 20 210 < 20
2015 2015-04-06 20 210 < 20
2015 2015-04-06 20 210 < 20
2015 2015-04-06 20 210 < 20
2015 2015-04-06 20 210 < 20
2015 2015-04-06 20 210 < 20
chromium-6 0.03 0 4.587 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-09-15 0.03 0 4.4
2015 2015-09-15 0.03 0 4.2
2015 2015-09-15 0.03 0 4.1
2015 2015-09-15 0.03 0 5.2
2015 2015-09-15 0.03 0 5.2
2015 2015-04-06 0.03 0 4.45
2015 2015-04-06 0.03 0 4.3
2015 2015-04-06 0.03 0 4.13
2015 2015-04-06 0.03 0 4.38
2015 2015-04-06 0.03 0 5.51
1,1-dichloroethane 0.03 6.14 < 0.03 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-09-15 0.03 6.139999866485596 < 0.03
2015 2015-09-15 0.03 6.139999866485596 < 0.03
2015 2015-09-15 0.03 6.139999866485596 < 0.03
2015 2015-09-15 0.03 6.139999866485596 < 0.03
2015 2015-04-06 0.03 6.139999866485596 < 0.03
2015 2015-04-06 0.03 6.139999866485596 < 0.03
2015 2015-04-06 0.03 6.139999866485596 < 0.03
2015 2015-04-06 0.03 6.139999866485596 < 0.03
1,2,3-trichloropropane 0.03 0.0004 < 0.03 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-09-15 0.03 0.00039999998989515007 < 0.03
2015 2015-09-15 0.03 0.00039999998989515007 < 0.03
2015 2015-09-15 0.03 0.00039999998989515007 < 0.03
2015 2015-09-15 0.03 0.00039999998989515007 < 0.03
2015 2015-04-06 0.03 0.00039999998989515007 < 0.03
2015 2015-04-06 0.03 0.00039999998989515007 < 0.03
2015 2015-04-06 0.03 0.00039999998989515007 < 0.03
2015 2015-04-06 0.03 0.00039999998989515007 < 0.03
1,3-butadiene 0.1 0.0103 < 0.1 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-09-15 0.1 0.010300000198185444 < 0.1
2015 2015-09-15 0.1 0.010300000198185444 < 0.1
2015 2015-09-15 0.1 0.010300000198185444 < 0.1
2015 2015-09-15 0.1 0.010300000198185444 < 0.1
2015 2015-04-06 0.1 0.010300000198185444 < 0.1
2015 2015-04-06 0.1 0.010300000198185444 < 0.1
2015 2015-04-06 0.1 0.010300000198185444 < 0.1
2015 2015-04-06 0.1 0.010300000198185444 < 0.1
1,4-dioxane 0.07 0.35 < 0.07 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-09-15 0.07 0.3499999940395355 < 0.07
2015 2015-09-15 0.07 0.3499999940395355 < 0.07
2015 2015-09-15 0.07 0.3499999940395355 < 0.07
2015 2015-09-15 0.07 0.3499999940395355 < 0.07
2015 2015-04-06 0.07 0.3499999940395355 < 0.07
2015 2015-04-06 0.07 0.3499999940395355 < 0.07
2015 2015-04-06 0.07 0.3499999940395355 < 0.07
2015 2015-04-06 0.07 0.3499999940395355 < 0.07
bromomethane 0.2 140 < 0.2 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-09-15 0.2 140 < 0.2
2015 2015-09-15 0.2 140 < 0.2
2015 2015-09-15 0.2 140 < 0.2
2015 2015-09-15 0.2 140 < 0.2
2015 2015-04-06 0.2 140 < 0.2
2015 2015-04-06 0.2 140 < 0.2
2015 2015-04-06 0.2 140 < 0.2
2015 2015-04-06 0.2 140 < 0.2
chloromethane 0.2 2.69 < 0.2 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-09-15 0.2 2.690000057220459 < 0.2
2015 2015-09-15 0.2 2.690000057220459 < 0.2
2015 2015-09-15 0.2 2.690000057220459 < 0.2
2015 2015-09-15 0.2 2.690000057220459 < 0.2
2015 2015-04-06 0.2 2.690000057220459 < 0.2
2015 2015-04-06 0.2 2.690000057220459 < 0.2
2015 2015-04-06 0.2 2.690000057220459 < 0.2
2015 2015-04-06 0.2 2.690000057220459 < 0.2
Halon 1011 0.06 90 < 0.06 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-09-15 0.06 90 < 0.06
2015 2015-09-15 0.06 90 < 0.06
2015 2015-09-15 0.06 90 < 0.06
2015 2015-09-15 0.06 90 < 0.06
2015 2015-04-06 0.06 90 < 0.06
2015 2015-04-06 0.06 90 < 0.06
2015 2015-04-06 0.06 90 < 0.06
2015 2015-04-06 0.06 90 < 0.06
HCFC-22 0.08 0 < 0.08 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-09-15 0.08 0 < 0.08
2015 2015-09-15 0.08 0 < 0.08
2015 2015-09-15 0.08 0 < 0.08
2015 2015-09-15 0.08 0 < 0.08
2015 2015-04-06 0.08 0 < 0.08
2015 2015-04-06 0.08 0 < 0.08
2015 2015-04-06 0.08 0 < 0.08
2015 2015-04-06 0.08 0 < 0.08
PFBS 0.09 0 < 0.09 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-09-15 0.09 0 < 0.09
2015 2015-09-15 0.09 0 < 0.09
2015 2015-09-15 0.09 0 < 0.09
2015 2015-09-15 0.09 0 < 0.09
2015 2015-04-06 0.09 0 < 0.09
2015 2015-04-06 0.09 0 < 0.09
2015 2015-04-06 0.09 0 < 0.09
2015 2015-04-06 0.09 0 < 0.09
PFHpA 0.01 0 < 0.01 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-09-15 0.01 0 < 0.01
2015 2015-09-15 0.01 0 < 0.01
2015 2015-09-15 0.01 0 < 0.01
2015 2015-09-15 0.01 0 < 0.01
2015 2015-04-06 0.01 0 < 0.01
2015 2015-04-06 0.01 0 < 0.01
2015 2015-04-06 0.01 0 < 0.01
2015 2015-04-06 0.01 0 < 0.01
PFHxS 0.03 0 < 0.03 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-09-15 0.03 0 < 0.03
2015 2015-09-15 0.03 0 < 0.03
2015 2015-09-15 0.03 0 < 0.03
2015 2015-09-15 0.03 0 < 0.03
2015 2015-04-06 0.03 0 < 0.03
2015 2015-04-06 0.03 0 < 0.03
2015 2015-04-06 0.03 0 < 0.03
2015 2015-04-06 0.03 0 < 0.03
PFNA 0.02 0 < 0.02 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-09-15 0.02 0 < 0.02
2015 2015-09-15 0.02 0 < 0.02
2015 2015-09-15 0.02 0 < 0.02
2015 2015-09-15 0.02 0 < 0.02
2015 2015-04-06 0.02 0 < 0.02
2015 2015-04-06 0.02 0 < 0.02
2015 2015-04-06 0.02 0 < 0.02
2015 2015-04-06 0.02 0 < 0.02
PFOA 0.02 0.07 < 0.02 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-09-15 0.02 0.07000000029802322 < 0.02
2015 2015-09-15 0.02 0.07000000029802322 < 0.02
2015 2015-09-15 0.02 0.07000000029802322 < 0.02
2015 2015-09-15 0.02 0.07000000029802322 < 0.02
2015 2015-04-06 0.02 0.07000000029802322 < 0.02
2015 2015-04-06 0.02 0.07000000029802322 < 0.02
2015 2015-04-06 0.02 0.07000000029802322 < 0.02
2015 2015-04-06 0.02 0.07000000029802322 < 0.02
PFOS 0.04 0.07 < 0.04 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-09-15 0.04 0.07000000029802322 < 0.04
2015 2015-09-15 0.04 0.07000000029802322 < 0.04
2015 2015-09-15 0.04 0.07000000029802322 < 0.04
2015 2015-09-15 0.04 0.07000000029802322 < 0.04
2015 2015-04-06 0.04 0.07000000029802322 < 0.04
2015 2015-04-06 0.04 0.07000000029802322 < 0.04
2015 2015-04-06 0.04 0.07000000029802322 < 0.04
2015 2015-04-06 0.04 0.07000000029802322 < 0.04
sec-butylbenzene 0.04 0 < 0.04 [+] Expand Test Data
Year Test Date MRL HRL Test Result
2015 2015-09-15 0.04 0 < 0.04
2015 2015-09-15 0.04 0 < 0.04
2015 2015-09-15 0.04 0 < 0.04
2015 2015-09-15 0.04 0 < 0.04
2015 2015-04-06 0.04 0 < 0.04
2015 2015-04-06 0.04 0 < 0.04
2015 2015-04-06 0.04 0 < 0.04
2015 2015-04-06 0.04 0 < 0.04

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
CA56457 lead 2014-01-01 2016-12-31 0mg/L
CA40548 lead 2011-01-01 2013-12-31 0mg/L

Violations


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

Compliance Dates Rule Violation Type Contaminant Name Status
2015-04-01 - 2015-06-30 Total Coliform Rule Maximum Contaminant Level Violation, Monthly (TCR) Coliform (TCR) Known
2012-05-01 - 2012-05-31 Total Coliform Rule Monitoring, Routine Minor (TCR) Coliform (TCR) Returned to Compliance
2010-11-01 - 2010-11-30 Total Coliform Rule Maximum Contaminant Level Violation, Monthly (TCR) Coliform (TCR) Known
2004-01-01 - 2004-01-31 Total Coliform Rule Monitoring, Routine Minor (TCR) Coliform (TCR) Known
- 2000-03-01 Lead and Copper Rule Initial Tap Sampling for Pb and Cu Lead and Copper 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.