Central & South Service Area (CSA & SSA)

Range

(LO/HI)

Range

(LO/HI)

Chromium Hexavalent

6 Uranium

 TTHMs [Total Trihalomethanes]

9 Total Coliform Bacteria

Special Notice: E. coli Detection:
On 08/27/2024, 10/15/2024 & 12/10/2024, SCWA received E. Coli positive distribution system samples in the Laguna/ Vineyard (CSA/ SSA) public water system. All three occurances triggered repeat and source well samples which returned negative for Total coliform and E. coli. On 12/11/2024, SCWA conducted a system survey and investigation which found no sanitary defects in the distribution system. SCWA believes the increase in E. coli positive samples was caused by the sampling method used by the company that took the samples. All bacteriological samples are now taken by SCWA operators.
Although E. coli was detected, the CSA/ SSA water system is not in violation of the E. coli MCL.

NOTES:
1. The Central and South Service Area (CSA/SSA) is a blend of groundwater from the Laguna/ Vineyard/ Country Creek Estates/ Grantline 99 water system and surface water from the Vineyard Surface Water Treatment Plant (VSWTP) and the City of Sacramento Water.
2. The State Water Resources Control Board Division of Drinking Water (SWRCB DDW) allows Sacramento County Water Agency (SCWA) to monitor for some contaminants less than once per year because the concentrations of these contaminants do not change frequently. Some of our data, though representative, are more than one year old.
3. Surface Water is from SCWA's VSWTP and from the City of Sacramento. Respectively, these sources provided approximately 56% and 9% of the water distributed to customers in 2024. For more information regarding the City of Sacramento's water quality data, go online (http://portal.cityofsacramento.org/Utilities/Education/water-quality) or call (916) 264-5011.
4. Total Trihalomethanes are the sum of Four Regulated THMs, i.e., Chloroform, Bromodichloromethane, Dibromochloromethane, and Bromoform.
5. Only Surface water sources must monitor for Disinfection By-Product precursors. Treatment Technique is not required if the raw or treated water TOC is < 2 PPM.
6. The SWRCB allows the measurement of gross alpha radiation as a surrogate for Uranium.
7. Haloacetic Acids are the Sum of Five Regulated HAAs, i.e., Monochloroacetic Acid, Monobromoacetic Acid, Dichloroacetic Acid, Dibromoacetic Acid, and Trichloroacetic Acid.
8. The CSA/SSA water system’s facilities are all fluoridated to reduce tooth decay in children. Studies show that water fluoridation reduces tooth decay by 20 to 40 percent. The SWRCB advised SCWA to implement the Center for Disease Control & Prevention's (CDC’s) recommended optimal fluoride content of 0.7 mg/L and control range of 0.6 mg/L – 1.2 mg/L. Information about fluoridation, oral health and current issues is available from
http://waterboards.ca.gov/drinking_water/certlic/drinkingwater/Fluoridation.html.
9. On Systems that collect more than 40 samples per month, the Total Coliform (TC) Bacteria MCL is 5% of the samples collected in any one month return TC positive. A positive TC sample triggers three (3) resamples in the distribution system and collection at the source (i.e., groundwater wells) of samples for TC & E. coli, per the federal Ground Water Rule (GWR) and the Revised Total Coliform Rule (RTCR). In 2024, all re-samples taken per the GWR & RTCR returned negative (absent) for TC & E. coli.
10. Turbidity is a measure of the cloudiness of the water. 0.124 NTU is the highest individual measurement in 2024. 100% of the monthly samples were in compliance (below the 0.3 NTU range). SCWA monitors turbidity because it is a good indicator of the effectiveness of its filtration systems. High turbidity can hinder the effectiveness of disinfectants. Only surface water sources must comply with PDWS for turbidity.

11 Total Hardness (as CaCO3)

12 Total Hardness (as CaCO3)

Our water system failed to monitor as required for drinking water standards during the past year and, therefore, was in violation of the regulations. Even though this failure was not an emergency, as our customers you have the right to know what you should do, what happened, and what we did to correct the situation.

The table below lists the contaminant(s) we did not properly test for during the last year, how many samples we are required to take and how often, how many samples we took, when samples should have been taken, and the date on which follow-up samples were taken. All of the samples were subsequently taken in the first quarter of 2025. The results for these samples came back at safe levels or non-detected.

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SAMPLE

DATE

Notification

Level (#15)

Response

Level (#16)

SAMPLE 

DATE

MRL

(ng/L)

Notification 

Level

NOTES:

18. Unregulated contaminant monitoring helps U.S. EPA and the State Water Resources Control Board to determine where certain contaminants occur and whether the contaminants need to be regulated.
19. SCWA is required by The Fifth Unregulated Contaminant Monitoring Rule (UCMR5), which was published by the U.S. EPA in December 2021, to monitor for 29 PFAS and lithium. The wells which had constituent levels greater than the
notification level (NL) have been taken off-line and are used for emergency purposes only. For more information, please visit https://www.epa.gov/dwucmr/fifth-unregulated-contaminant-monitoring-rule.