Waduk Cirata mengalami penurunan kualitas perairan, penyebab menurunnya kualitas perairan tersebut adalah masuknya limbah yang berasal dari limbah pertanian, domestik, industri, transportasi, peternakan dan perikanan. Terdapat jenis limbah yang masuk ke perairan mengandung logam berat timbal (Pb) seperti limbah industri, limbah transportasi dan limbah pertanian. Timbal berbahaya bagi lingkungan perairan dan organisme, yang banyak tersebar di Waduk Cirata seperti makrozoobenthos jenis tutut (Filopaludina javanica). Tutut dimanfaatkan sebagai sumber bahan pangan bagi warga di sekitar Waduk Cirata. Tujuan penelitian ini adalah untuk mengetahui tingkat pencemaran logam berat timbal (Pb) pada tutut di Waduk Cirata Jawa Barat. Penelitian dilakukan pada 18 September – 30 November 2018. Metode yang dilakukan adalah metode survey dan penentuan lokasi pengambilan sampel dengan purpose sampling. Pengambilan sampel air, substrat dan biota tutut dilakukan di tiga stasiun pengamatan. Analisis timbal (Pb) dilakukan pada sampel air, substrat, dan biota tutut dengan menggunakan Atomic Absorption Spectrophotometer (AAS). Hasil analisis menunjukkan bahwa Konsentrasi timbal (Pb) pada air yaitu 0,0307 mg/L, substrat berkisar antara 3,26 – 7,32 mg/kg dan tutut sebesar 0,05 mg/kg sedangkan nilai IFK0-s sebesar 0,0106 dan nilai IFK0-a sebesar 1,6286. Nilai konsentrasi yang dihasilkan pada air sudah melebihi ambang batas baku mutu sehingga perairan dapat dikategorikan sudah tercemar sedangkan nilai konsentrasi yang dihasilkan pada substrat dan tutut belum melebihi ambang batas baku mutu sehingga dikategorikan belum tercemar.

Danau Kota Lake is public attraction area, located in the middle area of Kuala Lumpur. An excessive count of visitors visiting the lake has weakening the lake water quality. The present study was driven to evaluate the lake water quality for environmental conservation. Some water quality and metals data were in-situ measured whereas some were collected for laboratory analysis. BOD, OG, AN and TC are identified as major pollutants towards Danau Kota Lake water quality. The decreasing concentration of DO and increasing of turbidity towards the deeper lake water column has been deteriorated the living water communities and caused hypoxic condition in the bottom water of Danau Kota Lake. Spatial variation of metals in the lake sediment has evidenced the accumulation of metals in the middle part of the lake area due to the sedimentation process. Based on PCA, the possible pollutant sources for this lake are the organic pollutants from the wastewater and industrial pollutants as well as the abundance of suspended algae. Since the water quality of Danau Kota Lake has marked some issues, the present study may assist Kuala Lumpur City Council to prevail the lake water quality challenge promptly by cost saving and in efficient manner.

Titiwangsa Lake is a renowned recreational lake in Kuala Lumpur, Malaysia. The present study was purposely to define the current status of Titiwangsa Lake water quality and propose a water quality monitoring program to conserve and sustain the health of this lake. Samples were collected in January 2017 during the day and night-time periods. Spatial classification using hierarchical agglomerative cluster analysis (HACA) has clustered the sampling stations into low, medium and high contaminated areas. Temporal classification of discriminant analysis (DA) forward stepwise mode has highlighted DO, chlorophyll-a and E-coli are the significant variables. They showed a lower range of data during the day-time period compared to night-time period. DA backward stepwise model showed  significant variables of total suspended solid (TSS) and total phosphate (TP) were higher in concentration during the day-time period as compared to night-time period. The significant of varimax factors (VFs) in the principal component analysis (PCA) might contribute by the landscaping, small-scale domestic wastewater, urban stormwater and land erosion. In a nutshell, based on HACA classification, samples can be collected at only three stations represent each cluster during the next water quality monitoring activities as this could reduce the time and cost of sampling and sample analysis.